Fixes #6433 .

also fixes #6338

Description

• Move the SaveImage Transform setters back to ensemble method to ensure DDP is initiated
• Use RankFilter to suppress logging for rank >0
• Minor updates such as renaming and tests

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.