Fixes Recurring Date Rules

Fløyen had an issue where a Recurring rule that went from 2025-10-01 to 2026-03-31
would fail to validate correctly for the entirity march.

I have rewritten the resolution engine to only care about month/days (depending on interval). I think this is inline with the original idea.
The tests still pass, and I have added a new one that ensures that the failing case is tested for in the future.

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