feat(cmp): cmp parameter to enable git creds to be shared (#8820)

[jmcshane]

Closes #8820
Closes #7995

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).
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This is a work in progress at this time to get input.

Fixes #14998

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 6 lines in your changes missing coverage. Please review.

Please upload report for BASE (master@092bb73). Learn more about missing BASE report.
Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
reposerver/repository/repository.go	57.14%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #15107   +/-   ##
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  Coverage          ?   55.20%           
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  Files             ?      324           
  Lines             ?    55128           
  Branches          ?        0           
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  Hits              ?    30434           
  Misses            ?    22089           
  Partials          ?     2605           

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[jmcshane]

Resolves #8820

[jmcshane]

This implementation is in line with the previous conversations in #8820 and #7995

[jmcshane]

The key difference between this implementation and what was reverted in #9105 is twofold:

• The provideGitCreds field added in the spec of the ConfigManagementPlugin. This field value is retrieve by a new call executed by the reposerver to access metadata about the plugin.
• The creds are appended to the environment within individual executions of the function runConfigManagementPluginSidecars rather than in the more global execution of getPluginEnvs

[thesuperzapper]

@pasha-codefresh @crenshaw-dev This is probably the closest thing we have to a resolution for #8820.

I think it's critical that ArgoCD plugins can access the ArgoCD credentials in some safe way, so I would appreciate your comments on this PRs approach.

[crenshaw-dev]

Took a quick glance, just a few small things

[jmcshane]

@crenshaw-dev that test is passing now

[jmcshane]

@crenshaw-dev would you be able to provide a pass back through this or remove the blocking review?

[jmcshane]

We've had a good back and forth on this PR and I'm going to leave it at this point. I've regularly rebased the PR to the latest master to ensure that the tests are in a healthy state with recent changes and this will be the last time I do it until I get constructive feedback.

If other folks want to take up moving this forward, the PR should be in a good place to support this. I understand the constraints of managing a large open source project like this one, but I need to take my eye off this PR for the time being.

[jmcshane]

@crenshaw-dev that test is passing, the failed integration tests were related to flakiness on dev. Can this be merged?