fix(controller): reduce memory by filtering ReplicaSet informer

[blkperl]

Fixes #2552

Use a separate replicaSetInformerFactory with WithTweakListOptions to limit the ReplicaSet informer cache to only ReplicaSets that have the rollouts-pod-template-hash label (i.e. those owned by Rollouts).

This avoids caching ReplicaSets from Deployments and other controllers, significantly reducing memory usage on clusters with large numbers of ReplicaSets.

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
• My builds are green. Try syncing with master if they are not.
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• I have run all tests locally (including the flaky ones) and they pass on my workstation
• I have used LLM/AI/Agent tools for this PR but I am responsible for all code of this PR
• I understand what the code does and WHY/HOW it works in several scenarios
• I know if my code is just adding new functionality or changing old functionality for existing users
• My organization is added to USERS.md.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.94%. Comparing base (e046515) to head (36bc32d).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4666      +/-   ##
==========================================
+ Coverage   84.86%   84.94%   +0.07%     
==========================================
  Files         164      164              
  Lines       18954    18965      +11     
==========================================
+ Hits        16086    16109      +23     
+ Misses       2007     2001       -6     
+ Partials      861      855       -6     

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[github-actions]

Published E2E Test Results

  4 files    4 suites   3h 33m 58s ⏱️
120 tests 111 ✅  7 💤 2 ❌
482 runs  452 ✅ 28 💤 2 ❌

For more details on these failures, see this check.

Results for commit 36bc32d.

♻️ This comment has been updated with latest results.

[github-actions]

Published Unit Test Results

2 443 tests   2 443 ✅  3m 18s ⏱️
  129 suites      0 💤
    1 files        0 ❌

Results for commit 36bc32d.

♻️ This comment has been updated with latest results.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[zachaller]

I really like this PR, do you have any personal graphs or anythign that can show the savings a bit. It seems logical I am just curious if/what you have seen?