git-notes are stored in refs/notes/commits as commit objects. This means
when we push the notes to gitlab the BranchCheck, TagCheck, and
DiffCheck classes are parsing those commits. Users don't control these
commits, git handles those internally, the messages are produced by git
e.g.

`Notes added by 'git notes add'`
`Notes removed by 'git notes remove'`

Before this change, git-notes commits were being flagged by
push_rule.commit_regex as not following the regex.

We currently don't have any rules for checking notes so we can skip
these for the time-being.

Fixes #207807

Changelog: fixed