🐛 fix(controller-gen): correctly handle individual file paths (e.g.,paths=./apis/v1/types.go) instead of only accepting directories or recursive patterns.

[camilamacedo86]

What was broken

The loader treated all filesystem paths as directories, causing errors when individual files were specified:

# This failed with "not a directory" error
controller-gen object paths=./apis/v1beta1/some_types.go
                                                                              
Error: load packages in root ".../some_types.go": err: fork/exec
/usr/local/go/bin/go: not a directory                                         

What this fixes

Added file detection logic to distinguish between files and directories. Now individual file paths work correctly:

  controller-gen object paths=./apis/v1beta1/some_types.go                      
  controller-gen object paths=./apis/v1          # still works                  
  controller-gen object paths=./apis/...         # still works    

PS: We are increasing the coverage as well to ensure that it works well with all scenarios.

Closes: #837

[k8s-ci-robot]

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[sbueringer]

Please remove the controller-gen binary from this PR

[camilamacedo86]

Please remove the controller-gen binary from this PR

Good catcher. We need to add it to the .gitignore
I will do that in a follow-up.
Done, it can get merged now.