docs: intra-bucket copy/move for GCP Storage Bucket binding

[nelson-parente]

Summary

Documents the updated copy and move operations for the GCP Storage Bucket binding, which now support intra-bucket copy/move (Dapr 1.19):

• destinationBucket is now optional — defaults to the component's configured bucket when omitted.
• New optional destinationKey field — the destination object key; defaults to the source key when omitted.
• At least one of destinationBucket / destinationKey must be provided (omitting both is an error).
• Both operations are performed server-side and preserve content type, metadata, and ACLs.

Added intra-bucket examples for both copy and move (e.g., moving public/file.xlsx → adhoc/file.xlsx within the same bucket).

Code: dapr/components-contrib#4410
Relates to: dapr/components-contrib#4377

[Copilot]

Pull request overview

Updates the GCP Storage Bucket binding documentation to reflect Dapr 1.19 behavior for copy and move, adding support for intra-bucket operations by making destination fields optional and documenting the new request shape and examples.

Changes:

• Document destinationBucket as optional (defaults to the component bucket) for copy and move.
• Add and document new optional destinationKey for copy and move (defaults to source key).
• Add intra-bucket copy/move examples using destinationKey without destinationBucket, and clarify the “both omitted is an error” rule.

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