Sorting projects - Persist last choice

What does this MR do?

EE port: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/15105

This MR:

• Adds new projects_sort column to user_preferences table
• Saves project sort preference to backend
• Renames issuable_sorting_field to sorting_field as it is now used in projects
• Extracts sorting preference logic from IssuableCollections to a new SortingPreference concern so that it can be reused to projects (and groups in the future https://gitlab.com/gitlab-org/gitlab-ce/issues/50803)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and testing

N/A

Security

N/A