Filter out Exclude Paths for PR Pipelines

[JimSuplizio]

@scbedd and @weshaggard

These are the common changes required to filter out PackageInfo generation by what should be excluded from the pull request pipelines. This is the example in Python, which excludes sdk/cosmos. The unfortunate thing here is that we can't access the pr->paths->exclude meaning this needs to be duplicated. Because of the default in the save-package-properties.yml nothing will break if the ExcludePaths aren't plumbed through. The only downside here is that wildcards aren't accepted but then again, most excludes in yml files aren't wildcarded.

I'd created a draft PR in Python to test these changes. Notice that the PR had changes in Cosmos and Template. This is the test run and if you notice, Cosmos no longer has a PackageInfo file in the artifacts and it's no longer running tests for azure-cosmos in the pullrequest pipeline. The diff.json for the PR is below which correctly has ExcludePaths.

{
  "ChangedFiles": [
    "eng/common/pipelines/templates/steps/save-package-properties.yml",
    "eng/common/scripts/Generate-PR-Diff.ps1",
    "eng/common/scripts/Package-Properties.ps1",
    "eng/pipelines/templates/jobs/ci.yml",
    "eng/pipelines/templates/stages/archetype-sdk-client.yml",
    "eng/pipelines/templates/steps/build-package-artifacts.yml",
    "sdk/cosmos/azure-cosmos/README.md",
    "sdk/pullrequest.yml",
    "sdk/template/azure-template/README.md"
  ],
  "ChangedServices": [
    "cosmos",
    "pullrequest.yml",
    "template"
  ],
  "ExcludePaths": [
    "sdk/cosmos"
  ],
  "PRNumber": "39185"
}

Last but not least, the test PR in Python also shows where ExcludePaths would have to be plumbed through. Once this gets reviewed and pushed out to the repositories, I'll end up making those changes in Python. For Java, we'll have more excludes, mostly for Track1 libraries, Cosmos, resourcemanagerhybrid and possibly Spring.

Fixes #9634

[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

[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