chore(deps): bump k8slibs to v0.33.3 and controller-runtime to v0.21.0

[perdasilva]

Summary

Closes #190 #220 #221 #222 #223

• Bumps kube and controller-runtime dependency versions (brings go version bump to go1.24)
• Refactors managedcache for breaking change coming from controller-runtime
• Refactors tests to use t.Context() where possible (lint complaint)
• Bumps go version in CI GHA

NOTE: t.Context() cannot be used inside t.Cleanup. Therefore, I had to do some //nolint:usetesting and use context.Background() in some places.

Change Type

Dependency update

Check List Before Merging

• This PR passes all pre-commit hook validations.
• This PR is fully tested and regression tests are included.
• Relevant documentation has been updated.

Additional Information

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.99%. Comparing base (ae7fc35) to head (f55c20a).

Files with missing lines	Patch %	Lines
managedcache/trackingcache.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #218      +/-   ##
==========================================
- Coverage   45.81%   44.99%   -0.83%     
==========================================
  Files          27       27              
  Lines        2916     2916              
==========================================
- Hits         1336     1312      -24     
- Misses       1476     1500      +24     
  Partials      104      104              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[erdii]

Looks good - Thanks!
I pointed out a small nit and expressed my confusion about the linter.

Good stuff!
We'll merge this after we've fixed another bug.

[erdii]

These conflicts don't have to be fixed here. We have temporarily removed the file and will re-introduce it again before merging this PR.