feat: support ability to run only the analysis controller

[gdsoumya]

This PR introduces the ability to run only the AnalysisRun controller, without needing the Rollout and Experiment CRDs to be installed in the cluster. This allows users/projects to adopt Argo Rollouts for the analysis piece alone.

Usage:

./rollouts-controller --controller=analysis

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional with a list of types and scopes found here, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed my commits with DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My builds are green. Try syncing with master if they are not.
• My organization is added to USERS.md.

[github-actions]

Go Published Test Results

2 097 tests   2 097 ✅  2m 49s ⏱️
  118 suites      0 💤
    1 files        0 ❌

Results for commit 661807f.

♻️ This comment has been updated with latest results.

[github-actions]

E2E Tests Published Test Results

  4 files    4 suites   3h 30m 25s ⏱️
106 tests  96 ✅  6 💤  4 ❌
442 runs  398 ✅ 24 💤 20 ❌

For more details on these failures, see this check.

Results for commit 661807f.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Attention: 82 lines in your changes are missing coverage. Please review.

Comparison is base (5e5314b) 81.77% compared to head (661807f) 81.53%.

Files	Patch %	Lines
controller/controller.go	20.83%	72 Missing and 4 partials ⚠️
utils/record/record.go	40.00%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3336      +/-   ##
==========================================
- Coverage   81.77%   81.53%   -0.25%     
==========================================
  Files         135      135              
  Lines       20649    20726      +77     
==========================================
+ Hits        16886    16898      +12     
- Misses       2888     2952      +64     
- Partials      875      876       +1     

☔ View full report in Codecov by Sentry.
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[sonarcloud]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

4 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[jessesuen]

LGTM, but would like @zachaller to sign off.

[zachaller]

LGTM, this opens up some interesting use cases.