Release feature: Link Jira issues to GitLab deployments
What does this MR do and why?
This MR removes the jira_deployment_issue_keys
feature flag to release
the feature of linking Jira issues to GitLab deployments.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #300031 (closed)