Adjust filters for long term events

[JoeyStk]

Short description

This PR refactors the event filters, adjusts the filters for long term events and adds a test.

Proposed changes

• Refactor event list
• Adjust filters
• Add test

Side effects

• Please check if I didn't break anything with the refactoring
• I deleted all comments as I think the code is more speaking now - but this might be "author blindness", so please let me know if you want to restore any comments

Resolved issues

Fixes: #3379

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Pull Request Review Guidelines

[JoeyStk]

If some knows how to fix the tests, I'm open to suggestions! @jonbulz Mizuki gave me the hint that you might something about this :)

[jonbulz]

@JoeyStk alright seems that renaming the test-event has a lot of implications 😅
Maybe this is good use for test specific fixtures? Why did you re-name the events anyway?

[JoeyStk]

Why did you re-name the events anyway?

My idea was to be explicit. The test event is a weekly recurring event and we use it for this case and while refactoring I thought it would be the cleaner way to rename it and to be clear about what the test is for. I wouldn't mind it too much if I had to name it back, but don't think it's ideal :)

[jonbulz]

@JoeyStk it took longer than anticipated, but I finally fixed the tests. Could you have a look at my changes?

[JoeyStk]

Thank you soooo much! 😍 I'll check it out in a bit :)

[JoeyStk]

To me it looks and works as expected! So this PR is ready to have it's second review :)