GCS client library migration in Java SDK - part 2b (#37592)

* Add copy() and remove() for GcsUtil V2.

* Add tests and modify copy and remove to take strategies

* Add deprecated annotations to V1 copy and remove.

* Refactor MissingStrategy and OverwriteStrategy enums. Add rewriteHelper() and move().

* Add rename tests and refacor copy and remove tests.

* Refactor rename

* Add experimental annotations to the new copy, remove and rename

* Remove unused import.

* Fix style.

* Trigger post commit java for the integration tests of GcsUtil.

* Revise according to reviews.

Tagging release

Tagging release

Go SDK v2.71.0-RC3

Go SDK v2.71.0-RC2

Add nanosecond timestamp support for Storage write when writing Gener…

…icRecords and Beam Rows (#37235)

* Beam row.

* Avro

* fixes.

* tests.

* fix tests.

* Update tests.

* comments.

* fix test.

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Co-authored-by: Claude <[email protected]>

Go SDK v2.71.0-RC1