Add present option to absence creation form

Right now, we have only absence reasons as choices and not the present option.

changed milestone to /AlekSIS%"[NLnet #6 (closed)] Fix bugs/missing small features from pilot schools"

added part::frontend source::customer::kath type::bug workflow::current-todo labels

assigned to @ZugBahnHof

assigned to @yuha and unassigned @ZugBahnHof

created branch 349-add-present-option-to-absence-creation-form to address this issue

mentioned in merge request !461 (merged)

mentioned in issue AlekSIS/onboarding/AlekSIS-App-Kolego#39 (closed)

mentioned in commit 179d0aac

closed with merge request !461 (merged)