* Add support for per-backup agent encryption flag
* Adjust
* Don't attempt decrypting an unprotected backup
* Address review comments
* Add some tests
* Add fixture
* Rename fixture
* Correct condition for when we should encrypt or decrypt
* Update tests in integrations
* Improve test coverage
* Fix onedrive tests
* Add test
* Improve cipher worker shutdown
* Improve test coverage
* Fix google_drive tests
* Move inner class _CipherBackupStreamer._WorkerStatus to module scope
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