feat: Detect unused Vertical Pod Autoscalers (VPAs)

[hurzelpurzel]

What this PR does / why we need it?

This adds unused VPA detection

PR Checklist

• This PR adds K8s exceptions (false positives)
• [ x] This PR adds new code
• [ x] This PR includes tests for new/existing code
• [ x ] This PR adds docs

GitHub Issue

#566

Notes for your reviewers

AI assisted by: Opencode ( BigPickle)

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

❌ Patch coverage is 53.57143% with 78 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.34%. Comparing base (2ac1fcf) to head (67cec67).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/kor/delete.go	32.35%	21 Missing and 2 partials ⚠️
pkg/kor/vpas.go	72.72%	12 Missing and 9 partials ⚠️
pkg/kor/all.go	0.00%	16 Missing ⚠️
cmd/kor/vpas.go	0.00%	10 Missing ⚠️
pkg/kor/multi.go	20.00%	8 Missing ⚠️
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #624      +/-   ##
==========================================
+ Coverage   46.95%   47.34%   +0.38%     
==========================================
  Files          69       71       +2     
  Lines        3963     4125     +162     
==========================================
+ Hits         1861     1953      +92     
- Misses       1795     1855      +60     
- Partials      307      317      +10     

☔ View full report in Codecov by Harness.
📢 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.