Remove optimize_propagate_integration_projects feature flag

Rezrequested to merge
reza/cleanup-ff-optimize-propagate-integration-projects into master

What does this MR do?

Removes the optimize_propagate_integration_projects feature flag and the old unoptimized code path. The optimized integration propagation query is now always enabled.

The flag was rolled out to 100% on production and has been stable since 18.10.

Changes

  • Remove Feature.enabled? check and old code path in PropagateService
  • Delete feature flag YAML definition
  • Clean up specs (un-nest shared examples, remove FF-disabled context)

Related to #593152 (closed)

Edited by Rez

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