Add rate limit to issue creation

What does this MR do?

https://gitlab.com/gitlab-org/gitlab/-/issues/55241 These changes add the limit to Projects::IssuesController and a new section to the Network page in Settings to change this value.

Documentation: !29130 (merged)

Second iteration for adding the rate limit to the API endpoint here: !28130 (merged)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Closes #55241