Ensure getPrList() results integrity mid-run

[rarkins]

Describe the proposed change(s).

It's important that platform.getPrList() returns an accurate list, particularly after PRs are created.

Check each platform to make sure that createPr() and updatePr() both mutate/update any saved PR lists for each platform.

[rarkins]

While looking into this, please also check on whether the PR list is cached reliably too.

[RahulGautamSingh]

Summarizing the tasks for this PR:

Platform Storage Details

Platform	getPrList() Storage Location	Updates Storage On: createPr()	Updates Storage On: updatePr()
Azure	local config	✅	✅
Bitbucket Cloud	repo cache	✅	❌
Bitbucket Server	local config	✅	✅
CodeCommit	local config	❌	❌
Gerrit	function not used	❌	❌
Gitea	repo cache	✅	✅
Github	local config & repo cache	✅	✅
Gitlab	local config	✅	❌

Implementation Tasks

Primary Task

• Implement updatePr() storage updates for:
  • Bitbucket Cloud (repo cache)
  • Bitbucket Server (local config)
  • Gitlab (local config)

Optional Platforms

Consider implementation for:

• CodeCommit
• Gerrit
  (Note: Lower priority, implementation might not be needed)

Test Cases

For each platform, verify:

1. PR Creation

   • Verify created PR appears in getPrList() immediately after creation
   • Verify created PR persists in getPrList() on subsequent runs -- if cache is used

2. PR Updates

   • Verify bot-updated PR info appears in getPrList() after updatePr() call
   • Verify updated PR info persists in getPrList() on subsequent runs -- if cache is used

3. External Updates -- if cache is used

   • Verify getPrList() reflects changes made via platform UI ie. cache.reconcile function is working as expected

[rarkins]

Code Commit can be skipped as it's deprecated. Gerritt also unless it's really quick. Ideally all platforms would update the PR cache correctly too