* MM-49564: Upsert in the Store vs App layer
Refactor drafts so that Upserting a draft would happen in the DB and not
in the app layer.
* Fixes mocks
* Fixes tests
* Fixes translations
* Fixes tests
* Update tests
* Fixes tests
* Addresses review comments
- renames Save => Upsert
- removes Sleep from tests
* Fixes flaky test
---------
Co-authored-by: Mattermost Build <build@mattermost.com>