The changes include the following refactoring in gke-persistent-volume module:

1. Map Lookups for Templates and Template Variables instead of nested ternary operators used across the file.
2. Simplified Content Rendering: pv_content and pvc_content are now generated with single templatefile calls, using the maps to get the correct path and variables.

This overalls improves the readability and maintainability of the module as the storage types are added to this module in future.