[UUX] Improve save button visibility when creating/editing notifications

## Hints / Details

R24.05 UUX feedback:
-- not blocking --
Create Notification
Save Button hard to find – should be with the data entered? Depending on screensize when scrolling down this is not visible

How to improve this:
- Move the save button somewhere else -> Where exactly? If it is at the bottom it might not be visible either, when not scrolling down. Having it move around dynamically seems counterproductive too.
- Make the save button 'static' -> Always visible in the top right (or bottom right?), always on top of other elements
- -Make the page 'static' -> Not scrollable (But how to deal with different screens / window sizes?)-

My suggestion: Option 2 - Make the button always visible
**but** open questions:
- What about the elements it might be concealing? Have to keep that in mind.
- What about the other actions? For example in the notification detail view, there are multiple other actions (approve, close, cancel, acknowledge, accept, decline, edit) -> Do they have to have the same behaviour then?
-> Most likely concept needed

## Acceptance Criteria
- [ ] Concept created
- [ ] Add a sticky save button