fix: use webhook ns if empty, more test versions

[beeme1mr]

This PR

Reintroduces using admission webhook namespace if pod namespace is empty

Related Issues

Fixes #500

Notes

This was accidentally removed during a recent refactor. It wasn't caught in our tests because the oldest version that's tested is 1.25. I've added a comment above the change to make it clear why this logic is there.

[codecov]

Codecov Report

Merging #568 (7619de5) into main (4c0fe34) will increase coverage by 0.07%.
The diff coverage is 100.00%.

❗ Current head 7619de5 differs from pull request most recent head a4ffad1. Consider uploading reports for the commit a4ffad1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #568      +/-   ##
==========================================
+ Coverage   87.90%   87.98%   +0.07%     
==========================================
  Files          10       10              
  Lines         926      932       +6     
==========================================
+ Hits          814      820       +6     
  Misses         89       89              
  Partials       23       23              

Files	Coverage Δ
webhooks/pod_webhook.go	86.66% <100.00%> (+0.80%)	⬆️

Flag	Coverage Δ
unit-tests	87.98% <100.00%> (+0.07%)	⬆️

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[toddbaert]

If we're going to maintain code to support older versions, why not just test older versions as well so we actually see when we break them?

[toddbaert]

@beeme1mr @thisthat can we add 1.22 - 1.28 here?

[beeme1mr]

We could update the matrix to [ v1.22.0, v1.28.0 ] so that it covers the minimum tested version and the latest. Testing all the versions in between would lead to painfully long test runs.

[toddbaert]

We could update the matrix to [ v1.22.0, v1.28.0 ] so that it covers the minimum tested version and the latest. Testing all the versions in between would lead to painfully long test runs.

They run in parallel: https://github.com/open-feature/open-feature-operator/actions/runs/7061357527/job/19222819640?pr=569