Add a message parameter for the suggestion endpoints

This MR addressed the backend component of #25381 (closed) - adding a 'message' parameter to the suggestion endpoints

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

• 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

Related to #25381 (closed)