fix: Don't update projekt anki note types if note types add-on is installed

This fixes an important problem that affects ProjektAnki subscribers.

Pushing this issue to the top, as at least for our German Anki Project (@Projekt_Anki_Germany) this is a breaking issue, due to problems with our notetype we originally uploaded to AnkiHub (and can’t change after the fact).

These issues can be fixed using our notetype add-on, however, this is a giant problem for some of our users with more extensive custom work (as effectively every accepted suggestions results in having to re-do one’s customisations).

Related issues

Community report from ProjektAnki maintainers: https://community.ankihub.net/t/breaking-ankihub-sync-resets-notetype-settings/240078/3

Proposed changes

Don't update ProjektAnki note types if the projekt anki note types add-on is installed
Add tests

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.49%. Comparing base (40bae5d) to head (365bf96). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #975 +/- ## ========================================== + Coverage 87.48% 87.49% +0.01% ========================================== Files 66 66 Lines 6678 6685 +7 ========================================== + Hits 5842 5849 +7 Misses 836 836 ```

AnkiHubSoftware / ankihub_addon