Resolve "Don't allow to reopen visit if user has any unfinished visit"

Closes #471

See merge request NCER-PD/scheduling-system!360

Merge remote-tracking branch 'origin/master' into 471-don-t-allow-to-reopen-visit-if-user-has-any-unfinished-visit

Resolve "not checked `referred by` checkbox causes error"

Closes #468

See merge request NCER-PD/scheduling-system!361

Resolve "merge migrations so tests are running faster"

Closes #479

See merge request NCER-PD/scheduling-system!356

Speed up tests

See merge request NCER-PD/scheduling-system!357

python 3.10 is not supported

See merge request NCER-PD/scheduling-system!358