chore(aggregators): Comment out default values in sample configs

[Hipska]

Summary

• Aligns all aggregator sample configs so they have commented out defaults for the common parameters.
• Adds a test to validate the sample config

Checklist

• No AI generated code was used in this PR

Related issues

[telegraf-tiger]

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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

[Hipska]

!retry-failed

[srebhan]

@Hipska please do not add the tests here. I would suggest to add a test to config/config_test.go iterating over all known plugins and do this. Maybe one test per plugin category would be the best. This way we do have the test in one place and do not need to stray the code across all plugins...

[Hipska]

We discussed this before when I introduced the DefaultSampleConfig testutil. I wanted to do something like that, but you were opposed to that since some plugins have special handling of the sample config and thus cannot be tested like you just requested..

[srebhan]

I said we should be careful with the test and add a whitelist for plugins we know are different.

[Hipska]

So, next actions: Remove the tests?

[srebhan]

Yes.

[srebhan]

Thanks a lot @Hipska!