chore: remove calendar and matomo packages as well as daily statistics

[ovbm]

No description provided.

[lucianak]

Looks good, but some things are still missing:

• migrations need to be handled somehow, at the moment this would fail. Maybe we could introduce a new migration that deletes the calendar tables in a different module, and the js files in the migration module need to be deleted
  will not break anything, but for cleanup:
• remove calendar stuff from extractPersonalData script
• remove translations

[ovbm]

Looks good, but some things are still missing:

• migrations need to be handled somehow, at the moment this would fail. Maybe we could introduce a new migration that deletes the calendar tables in a different module, and the js files in the migration module need to be deleted
  will not break anything, but for cleanup:
• remove calendar stuff from extractPersonalData script
• remove translations

Good point. What if we add a sqls folder in the backend-modules "migrations" and:

1. copy and paste all the migration sqls files from the modules we want to delete into that folder
2. change the reference in the migration's javascript files

Or alternatively: We delete all related migration files. If we're getting rid of the table anyways, we might as well delete those.

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[ovbm]

• Removed translation strings
• Removed reference in extractPersonalData
• Removed all migration.js files referencing calendar migrations