Remove feature flag fetch_tags_from_registry_api
What does this MR do and why?
In this MR, we are removing the feature flag fetch_tags_from_registry_api
to fully release the feature - when fetching the tags of the container repository, we use the container registry API if it's available.
Changelog: changed
MR acceptance checklist
Related to #442576 (closed) Related to #432471 (closed)