[Frontend] Quality notifications to multiple BPNs

[ds-crehm]

As user,
I want to be able to send notifications to multiple BPNs,
so that I don't have to create notifications for each BPN individually.

Hints / Details

#964 is needed for the BPN input when creating alerts.
#899 first acceptance criteria is needed before starting work on frontend implementation.

Implement concept #849


https://miro.com/app/board/uXjVO5JVoho=/?moveToWidget=3458764586657591852&cot=10

Backend implementation: #899

Acceptance Criteria

• During the creation of an investigation, the BPNs are 'pulled' from the selected parts and cannot be changed manually
• During the creation of an alert, the user can add BPNs manually
  • Autocomplete filter is implemented -> the selection shows all matching BPNs (if there are more than 10, the selection is scrollable)
  • Selected BPNs are shown as chips that can be removed
• After the user creates a notification that must be sent to multiple BPNs, he will be shown a modal with a summary asking for confirmation.
• After clicking 'Approve', the notification and all 'duplicates' are created.
• Update User Manual / Admin manual / Arc42
• Update tests