Swap integer and bigint columns for notes and dependent tables for self-managed

This is the next step after Initialize the migration of notes.id and depend... (#389306 - closed). The process is outlined here.

These columns were already swapped for GitLab.com with #392815 (closed), now we have to do it for self-managed instances.

The columns we need to migrate are

• notes.id !127566 (merged)
• todos.note_id !125837 (merged)
• system_note_metadata.note_id !128803 (merged)
• epic_user_mentions.note_id !128797 (merged)
• suggestions.note_id !128892 (merged)
• issue_user_mentions.note_id !128934 (merged)
• note_diff_files.diff_note_id !128983 (merged)
• snippet_user_mentions.note_id !128991 (merged)
• design_user_mentions.note_id !129111 (merged)
• vulnerability_user_mentions.note_id !129082 (merged)
• commit_user_mentions.note_id !129117 (merged)
• merge_request_user_mentions.note_id !129134 (merged)
• timelogs.note_id !129258 (merged)
• award_emoji.awardable_id !129263 (merged)
• events.targe_id !129379 (merged)