Stop repeating annotation date in tooltip when unambiguous

[apata]

Changes

1. Fixes "Edit note" button being covered by scrollbar in cases where the authorship line is longer due to long author name
2. Fixes missing space in note authorship line, it was cut away due to how HTML handles leading and trailing spaces
3. Stops showing note date & time in note authorship line when it's unambiguous. No point in repeating it in an already tightly packed tooltip.
4. Refactors annotations grouping logic to group by datetime labels with the T-separator (was grouping by labels with the space separator).

Tests

• Automated tests have been added

Changelog

• This PR does not make a user-facing change

Documentation

• This change does not need a documentation update

Dark mode

• The UI has been tested both in dark and light mode

[github-actions]

Preview environment👷🏼‍♀️🏗️
PR-6518