feat: implement tenant scoped database notifications

[KilianTrunk]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 5.00000% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.44%. Comparing base (ba0eb35) to head (68ef148).

Files with missing lines	Patch %	Lines
src/Notifications/Channels/SiteDatabaseChannel.php	0.00%	10 Missing ⚠️
src/Models/DatabaseNotification.php	0.00%	6 Missing ⚠️
src/Models/User.php	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #25      +/-   ##
============================================
- Coverage     73.15%   72.44%   -0.72%     
- Complexity      292      298       +6     
============================================
  Files            54       56       +2     
  Lines          1885     1905      +20     
============================================
+ Hits           1379     1380       +1     
- Misses          506      525      +19     

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