feat: WorkloadIdentity support for azure devops pull request generator.

[jagpreetstamber]

Closes #23705

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Title of the PR
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.
• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

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[codecov]

Codecov Report

❌ Patch coverage is 79.54545% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.65%. Comparing base (8fec5c5) to head (cfcc8ed).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
...plicationset/services/pull_request/azure_devops.go	79.06%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #25575      +/-   ##
==========================================
+ Coverage   62.60%   62.65%   +0.04%     
==========================================
  Files         353      353              
  Lines       49883    49918      +35     
==========================================
+ Hits        31229    31274      +45     
+ Misses      15660    15647      -13     
- Partials     2994     2997       +3     

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[ppapapetrou76]

I like the approach you have taken with the factory pattern and different implementations

I have left a few comments for your consideration

[ppapapetrou76]

LGTM 🏅 - thanks for addressing my comments