fix(blueprint): handle resource versioning in Flux CD resource updates

[rmvangun]

The PR addresses issues with Flux CD Kustomization and GitRepository resource updates by properly handling resource versions. Previously, updates would fail with "metadata.resourceVersion must be specified" errors due to missing version information during PUT operations.

Changes:

• Modified kubeClientResourceOperation to implement get-then-create-or-update pattern
• Added proper resource version handling for existing resources
• Improved error handling and type checking for metav1.Object implementations
• Removed inline comments in favor of clear function documentation
• Updated documentation to follow Windsor CLI style guide

This fix ensures reliable updates to Flux CD resources by including the required resource version during updates.