feat(common.cookie): Allow usage of secrets for header

[h0nIg]

Summary

common.cookie does not support secretstores, it may be required to send header values based on secretstores

Checklist

• No AI generated code was used in this PR

Related issues

resolves #15639

[telegraf-tiger]

Thanks so much for the pull request!
🤝 ✒️ Just a reminder that the CLA has not yet been signed, and we'll need it before merging. Please sign the CLA when you get a chance, then post a comment here saying !signed-cla

[ZPascal]

@srebhan or @powersj Could you please take a look?

[DStrand1]

Thanks for the PR! I just have one comment about documentation

[powersj]

Hi,

Can you please update the documentation in inputs.http and outputs.http as well? Both plugins have a "Secret-store support" config header that list the options that support secret stores. Please add cookie_auth_header to that list.

• inputs.http
• outputs.http

[ZPascal]

I have adapted the documentation locally. @h0nIg Can you please give me access to the repo to push it to the branch?

[telegraf-tiger]

Download PR build artifacts for linux_amd64.tar.gz, darwin_arm64.tar.gz, and windows_amd64.zip.
Downloads for additional architectures and packages are available below.

🥳 This pull request decreases the Telegraf binary size by -4.44 % for linux amd64 (new size: 251.9 MB, nightly size 263.6 MB)

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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