Disable resource grouping flag for exporter subcommand

[dabico]

What this PR does / why we need it?

Makes changes to flag definitions withing both the root command and all subcommands in such a way that everything except exporter will be able to specify --group-by.

PR Checklist

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

GitHub Issue

Closes #555

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.18%. Comparing base (58fc28d) to head (c52f522).

Files with missing lines	Patch %	Lines
cmd/kor/root.go	0.00%	7 Missing ⚠️
cmd/kor/all.go	0.00%	2 Missing ⚠️
cmd/kor/exporter.go	0.00%	2 Missing ⚠️
cmd/kor/clusterrolebindings.go	0.00%	1 Missing ⚠️
cmd/kor/clusterroles.go	0.00%	1 Missing ⚠️
cmd/kor/configmaps.go	0.00%	1 Missing ⚠️
cmd/kor/crds.go	0.00%	1 Missing ⚠️
cmd/kor/daemonsets.go	0.00%	1 Missing ⚠️
cmd/kor/deployments.go	0.00%	1 Missing ⚠️
cmd/kor/finalizers.go	0.00%	1 Missing ⚠️
... and 18 more
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #565      +/-   ##
==========================================
- Coverage   46.56%   46.18%   -0.38%     
==========================================
  Files          69       69              
  Lines        3930     3962      +32     
==========================================
  Hits         1830     1830              
- Misses       1794     1826      +32     
  Partials      306      306              

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