Clean up jira_connect_oauth feature flag on frontend
What does this MR do and why?
The jira_connect_oauth
has been enabled on GitLab.com and is being removed in %16.0. This MR removed the frontend checks for this feature flag.
Screenshots or screen recordings
How to set up and validate locally
https://docs.gitlab.com/ee/development/integrations/jira_connect.html#simple-setup
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
-
I have evaluated the MR acceptance checklist for this MR.
Related to #355048 (closed)