Feature/open project integration

What does this MR do?

This MR implements the Open Project Integration which is similar to JIRA.

The core feature is

1. create cross-reference comment when Commit/MR with open project issue number
2. close the issue when Commit/MR with the special word such as closes

What are the relevant issue numbers?

#21928 (moved)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer