* sdks/python: enable recursive deletion for GCS

In this commit, we enable recursive deletion for
GCS (Google Cloud Storage) paths, including directories
and blobs.

Changes include:
- Updated the `delete` method to support recursive deletion of GCS
  directories (prefixes).
- If the path points to a directory, all blobs under that prefix are
  deleted.
- Refactored logic to handle both single blob and directory deletion
  cases.

* sdks/python: update delete test case for GCS

In this commit, we update the delete test to verify
recursive deletion of directories (prefixes) in GCS.

Changes include:
- Added test for deleting a GCS directory (prefix) with multiple files.
- Verified files under a directory are deleted recursively when using the delete method.

* CHANGES.md: update CHANGES for `2.63.0`

* CHANGES.md: capitalize `enable` word