feat(appset): add Pull Request Generator for Azure DevOps Repos

[robinlieb]

Closes #12663

Pull Request Generators are currently implemented for GitHub, GitLab, GitTea and Bitbucket Server. This PR implements the functionality of Pull Request Generator for Azure DevOps Repos.

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 Toolchain Guide
• 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.
• Optional. My organization is added to USERS.md.
• 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.

Please see Contribution FAQs if you have questions about your pull-request.

[codecov]

Codecov Report

Patch coverage: 66.66% and project coverage change: +0.06 🎉

Comparison is base (8388ff7) 49.64% compared to head (23faba9) 49.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #13367      +/-   ##
==========================================
+ Coverage   49.64%   49.71%   +0.06%     
==========================================
  Files         258      260       +2     
  Lines       44192    44376     +184     
==========================================
+ Hits        21940    22060     +120     
- Misses      20091    20148      +57     
- Partials     2161     2168       +7     

Impacted Files	Coverage Δ
.../apis/application/v1alpha1/applicationset_types.go	31.11% <ø> (ø)
applicationset/generators/pull_request.go	45.00% <25.00%> (-7.95%)	⬇️
...plicationset/services/pull_request/azure_devops.go	60.91% <60.91%> (ø)
...cationset/services/pull_request/bitbucket_cloud.go	91.78% <91.78%> (ø)

... and 1 file with indirect coverage changes

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[tal19987]

When this feature will be merged and released?

[GuitaristForEver]

I have tested this feature on real azure devops service and I can confirm things work well

[GuitaristForEver]

I have tested this feature on a live Azure DevOps environment and it works as expected

[GuitaristForEver]

@crenshaw-dev Hi I see that @robinlieb has implemented the requested changes and e2e tests have passed, Are there any other actions that need to be done?

[crenshaw-dev]

@GuitaristForEver nothing else needed for the moment. I plan to go on another review sprint before we cut 2.8-rc1. This will be part of it.

[decodingahmed]

Hey @crenshaw-dev, we are eagerly awaiting the Azure DevOps support. Do you have a timeline of when this might be available for us to consume? Thanks

[crenshaw-dev]

Seems I borked the history trying to resolve conflicts. Working on it...

[crenshaw-dev]

k, think we're good to go