kube-derive: Add additional CRD tests

[NickLarsenNZ]

These are the passing tests copied across from #1839. The remaining tests (not included in this PR) do not pass, and will require a new issue and PR to resolve.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.2%. Comparing base (c8a25cb) to head (775487f).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1921     +/-   ##
=======================================
+ Coverage   76.1%   76.2%   +0.2%     
=======================================
  Files         86      88      +2     
  Lines       8399    8423     +24     
=======================================
+ Hits        6387    6415     +28     
+ Misses      2012    2008      -4     

Files with missing lines	Coverage Δ
kube-derive/tests/crd_complex_enum_test.rs	100.0% <100.0%> (ø)
kube-derive/tests/crd_mixed_enum_test.rs	100.0% <100.0%> (ø)

... and 6 files with indirect coverage changes

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[clux]

great tests. thank you very much.