test(inputs.redfish): Extend coverage in preparation of lib change

[inhinias]

Summary

Since the plan is to move to the gofish lib we extend the tests to work with them in a later pr.
Because gofish expects to move from the top of the api to lower nodes, every testcase requires
/redfish/v1/ & /redfish/v1/Systems/ to be present.

Also gofish does no trigger an invalid Response with a trailing "{". Therefore its moved to the start of the data.

Datacenter is supposed to be under the Postal address: tags["datacenter"] = chassis.Location.PostalAddress.DataCenter but its nowhere to be found in the standard. See page 35.

It should be considered if the "room" tag should be changed too since PostalAddress is deprecated.
This pr removes just the datacenter tag from the tests but not the actual program. That test would fail and is therefor skipped. Please inform me on how to handle this case for the "moving to gofish" pr.

Also i already added the testdata for the subsystems that will be added as a feature later.

Checklist

• No AI generated code was used in this PR
• AI generated code used in this PR follows the InfluxData Policy on AI-Generated Code Contributions

Related issues

Related to: #18963

[srebhan]

Thanks @inhinias! Please try to not change existing tests! Find my comments in the code...

[srebhan]

Can we please keep the previous version?

[srebhan]

Hmmm... The test should not fail, at least not if you don't change the plugin code, should it? If this is an issue arising when changing the underlying lib, please add the "skip" with that PR to document it is breaking things...

[srebhan]

Please don't change existing tests! Those are there for making sure your changes are backward compatible and thus should not be changed. If you need to change an existing test it means your plugin modifications are breaking!

Same for the other occurrences below.

[srebhan]

@inhinias I marked the resolved items as "resolved". However, there are three issues left...

[inhinias]

@srebhan SystemID, Datacenter Tags and test skip reverted.

[telegraf-tiger]

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. 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