Feat: show unused reason

[yonahd]

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What this PR does / why we need it

PR Checklist

• [ ] This PR adds K8s exceptions (false positives)
• [x] This PR adds new code
• [x] This PR includes test for any new code

Github Issue

[#167 ]

[yonahd]

Example output

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 47.01835% with 231 lines in your changes missing coverage. Please review.

Project coverage is 41.21%. Comparing base (ea85ff7) to head (04aa206). Report is 2 commits behind head on main.

Files	Patch %	Lines
pkg/kor/formatter.go	9.27%	134 Missing and 3 partials :warning:
pkg/kor/delete.go	15.09%	45 Missing :warning:
pkg/kor/crds.go	0.00%	6 Missing :warning:
pkg/kor/multi.go	0.00%	5 Missing :warning:
pkg/kor/pdbs.go	61.53%	5 Missing :warning:
pkg/kor/all.go	0.00%	4 Missing :warning:
pkg/kor/finalizers.go	70.00%	3 Missing :warning:
pkg/kor/services.go	80.00%	3 Missing :warning:
pkg/kor/statefulsets.go	78.57%	3 Missing :warning:
pkg/kor/hpas.go	75.00%	2 Missing :warning:
... and 16 more

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #278 +/- ## ========================================== + Coverage 40.87% 41.21% +0.34% ========================================== Files 58 59 +1 Lines 2953 3113 +160 ========================================== + Hits 1207 1283 +76 - Misses 1545 1627 +82 - Partials 201 203 +2 ```

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[yonahd]

@luisdavim @doronkg If you can take a look that would be great