Swap system_note_metadata.note_id to bigint

What does this MR do and why?

This MR finalizes the conversion to bigint for system_note_metadata.note_id for Gitlab.com, development and test environments, following the process outlined here.

It takes the following steps:

• Ensure the migration from note_id to note_id_convert_to_bigint is complete
• Create the new indexes and foreign keys for the swap to the bigint column. This was done async for GitLab.com with !117485 (merged).
• Swap the columns

The above will be introduced for self-managed in %16.0.

See #392815 (closed).

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.