fix(inputs.redfish): Extend testcases for gofish 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

[telegraf-tiger]

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