Save sorting preference for Issues/MRs in BE

What does this MR do?

Saves sort option and direction from issues and merge requests lists to the backend, so users default to their ordering preferences in any device they log in to.

This works in merge request and issue lists for:

• projects
• groups
• dashboard

What are the relevant issue numbers?

#50352 (closed) - Save issues and merge requests lists choice to BE

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• 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

Closes #50352 (closed)