Add ResourceType parameter

[mikeharder]

• Selects live test or perf test resources

[azure-sdk]

The following pipelines have been queued for testing:
java - template
java - template - tests
js - template
net - template
net - template - tests
python - template
python - template - tests
You can sign off on the approval gate to test the release stage of each pipeline.
See eng/common workflow

[heaths]

Overall, I like the changes, but I wonder if we should fall back to test-resources.* if perf-resources.* doesn't exist.

[benbp]

It's a pain, but I believe the parameter docs (the comments here and the markdown files) also need to be updated. Though to be honest, given that we don't have great automation for this, I'm inclined to delete the markdown @heaths?

[mikeharder]

I will update the docs in a separate PR. I want to unblock the language repo perf test pipelines. And updating the docs is a little tricky since I'm trying to decide if I want to replace test-resources.json with test-resources.json or perf-resources.json, or something like $ResourceType-resources.json.

[mikeharder]

@heaths: If you are OK with this as-is, can you please remove your "changes requested" review?

[ghost]

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