Remove column ignores after bigint conversion for notes and dependent tables

With #428250 (closed) done, we now can complete the last step from the process and remove the ignore rules for the *_convert_to_bigint columns.

The columns we no longer need to ignore are:

• notes.id
• todos.note_id
• system_note_metadata.note_id
• epic_user_mentions.note_id
• suggestions.note_id
• issue_user_mentions.note_id
• note_diff_files.diff_note_id
• snippet_user_mentions.note_id
• design_user_mentions.note_id
• vulnerability_user_mentions.note_id
• commit_user_mentions.note_id
• merge_request_user_mentions.note_id
• timelogs.note_id
• award_emoji.awardable_id
• events.target_id