Remove stale volunteer state

[Tschuppi81]

Feriennet: Remove stale volunteer state

On the feriennet demo instance cancelled volunteer state reached the db. The commit was later reverted, data remains

TYPE: Bugfix
LINK: ONEGOV-CLOUD-5FX

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.83%. Comparing base (f702cfc) to head (e146ac9).
✅ All tests successful. No failed tests found.

Additional details and impacted files

see 1 file with indirect coverage changes

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