chore: Fix linter findings for Darwin

[zak-pawel]

golangci-lint checks in Telegraf repo are by default run only for linux.
This PR addresses findings discovered after running following command:

GOOS=darwin make lint-branch

Following findings were fixed:

config/secret_without_mlock.go:9:14                     revive     unused-parameter: parameter 'secret' seems to be unused, consider removing or renaming it as _
plugins/inputs/cgroup/cgroup_notlinux.go:9:25           revive     unused-parameter: parameter 'acc' seems to be unused, consider removing or renaming it as _
plugins/inputs/diskio/diskio_other.go:7:27              revive     unused-parameter: parameter 'devName' seems to be unused, consider removing or renaming it as _
plugins/inputs/diskio/diskio_other.go:15:20             revive     unused-parameter: parameter 'name' seems to be unused, consider removing or renaming it as _
plugins/inputs/dmcache/dmcache_notlinux.go:9:26         revive     unused-parameter: parameter 'acc' seems to be unused, consider removing or renaming it as _
plugins/inputs/ethtool/ethtool.go:14:5                  unused     var `downInterfacesBehaviors` is unused
plugins/inputs/ethtool/ethtool_notlinux.go:15:26        revive     unused-parameter: parameter 'acc' seems to be unused, consider removing or renaming it as _
plugins/inputs/infiniband/infiniband_notlinux.go:15:1   revive     receiver-naming: receiver name should not be an underscore, omit the name if it is unused
plugins/inputs/infiniband/infiniband_notlinux.go:15:29  revive     unused-parameter: parameter 'acc' seems to be unused, consider removing or renaming it as _
plugins/inputs/intel_powerstat/dto.go:4:2               unused     field `mperf` is unused
plugins/inputs/intel_powerstat/dto.go:5:2               unused     field `aperf` is unused
plugins/inputs/intel_powerstat/dto.go:6:2               unused     field `timeStampCounter` is unused
plugins/inputs/intel_powerstat/dto.go:7:2               unused     field `c3` is unused
plugins/inputs/intel_powerstat/dto.go:8:2               unused     field `c6` is unused
plugins/inputs/intel_powerstat/dto.go:9:2               unused     field `c7` is unused
plugins/inputs/intel_powerstat/dto.go:10:2              unused     field `throttleTemp` is unused
plugins/inputs/intel_powerstat/dto.go:11:2              unused     field `temp` is unused
plugins/inputs/intel_powerstat/dto.go:12:2              unused     field `mperfDelta` is unused
plugins/inputs/intel_powerstat/dto.go:13:2              unused     field `aperfDelta` is unused
plugins/inputs/intel_powerstat/dto.go:14:2              unused     field `timeStampCounterDelta` is unused
plugins/inputs/intel_powerstat/dto.go:15:2              unused     field `c3Delta` is unused
plugins/inputs/intel_powerstat/dto.go:16:2              unused     field `c6Delta` is unused
plugins/inputs/intel_powerstat/dto.go:17:2              unused     field `c7Delta` is unused
plugins/inputs/intel_powerstat/dto.go:18:2              unused     field `readDate` is unused
plugins/inputs/intel_powerstat/dto.go:22:2              unused     field `dramCurrentEnergy` is unused
plugins/inputs/intel_powerstat/dto.go:23:2              unused     field `socketCurrentEnergy` is unused
plugins/inputs/intel_powerstat/dto.go:24:2              unused     field `socketEnergy` is unused
plugins/inputs/intel_powerstat/dto.go:25:2              unused     field `dramEnergy` is unused
plugins/inputs/intel_powerstat/dto.go:26:2              unused     field `readDate` is unused
plugins/inputs/intel_powerstat/dto.go:30:2              unused     field `physicalID` is unused
plugins/inputs/intel_powerstat/dto.go:31:2              unused     field `coreID` is unused
plugins/inputs/intel_powerstat/dto.go:32:2              unused     field `cpuID` is unused
plugins/inputs/intel_powerstat/dto.go:33:2              unused     field `vendorID` is unused
plugins/inputs/intel_powerstat/dto.go:34:2              unused     field `cpuFamily` is unused
plugins/inputs/intel_powerstat/dto.go:35:2              unused     field `model` is unused
plugins/inputs/intel_powerstat/dto.go:36:2              unused     field `flags` is unused
plugins/inputs/kernel/kernel_notlinux.go:25:23          revive     unused-parameter: parameter 'acc' seems to be unused, consider removing or renaming it as _
plugins/inputs/powerdns/powerdns_test.go:10:6           unused     type `statServer` is unused
plugins/inputs/powerdns/powerdns_test.go:47:21          unused     func `statServer.serverSocket` is unused
plugins/inputs/synproxy/synproxy_notlinux.go:15:27      revive     unused-parameter: parameter 'acc' seems to be unused, consider removing or renaming it as _
plugins/inputs/wireless/wireless_notlinux.go:15:27      revive     unused-parameter: parameter 'acc' seems to be unused, consider removing or renaming it as _
plugins/inputs/zfs/zfs_other.go:10:22                   revive     unused-parameter: parameter 'acc' seems to be unused, consider removing or renaming it as _
plugins/secretstores/os/os_darwin.go:16:70              errorlint  non-wrapping format verb for fmt.Errorf. Use `%w` to format errors

Following findings were ignored (mentioned fields/types are unused for darwin but are used for linux):

plugins/inputs/diskio/diskio.go:33:2       unused  field `infoCache` is unused
plugins/inputs/diskio/diskio_other.go:5:6  unused  type `diskInfoCache` is unused
plugins/inputs/ethtool/ethtool.go:43:2     unused  field `interfaceFilter` is unused
plugins/inputs/ethtool/ethtool.go:44:2     unused  field `namespaceFilter` is unused
plugins/inputs/ethtool/ethtool.go:45:2     unused  field `includeNamespaces` is unused
plugins/inputs/ethtool/ethtool.go:48:2     unused  field `command` is unused

[telegraf-tiger]

Download PR build artifacts for linux_amd64.tar.gz, darwin_amd64.tar.gz, and windows_amd64.zip.
Downloads for additional architectures and packages are available below.

👍 This pull request doesn't change the Telegraf binary size

📦 Click here to get additional PR build artifacts

Artifact URLs

DEB	RPM	TAR GZ	ZIP
amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	darwin_arm64.tar.gz	windows_arm64.zip
armel.deb	armv6hl.rpm	freebsd_amd64.tar.gz	windows_i386.zip
armhf.deb	i386.rpm	freebsd_armv7.tar.gz
i386.deb	ppc64le.rpm	freebsd_i386.tar.gz
mips.deb	riscv64.rpm	linux_amd64.tar.gz
mipsel.deb	s390x.rpm	linux_arm64.tar.gz
ppc64el.deb	x86_64.rpm	linux_armel.tar.gz
riscv64.deb		linux_armhf.tar.gz
s390x.deb		linux_i386.tar.gz
		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_riscv64.tar.gz
		linux_s390x.tar.gz

[powersj]

Thanks for cleaning these up

[srebhan]

Thanks @zak-pawel!