[Person overview] Implement multiple selection for marking absences as excused or for deleting

added part::frontend prio::1 source::customer type::feature labels

assigned to @yuha

assigned to @ZugBahnHof and unassigned @yuha

created merge request !111 (merged) to address this issue

mentioned in merge request !111 (merged)

added 1 deleted label

Please try to implement the filter with annotations and maybe Case-When constructs.

added board::ready label and removed 1 deleted label

added board::todo label and removed board::ready label

added board::ready label and removed board::todo label

closed with merge request !111 (merged)

mentioned in commit 35c5bfc7