refactor: overhaul nc files, calendar, and contacts rule exclusions

[EsadCetiner]

Rule exclusions for the File Manager is currently a mess and a pain to work with, these issues became even more obvious when I started work on fixing issues with the Nextcloud iOS app (The app is currently unusable) and I didn't want to compound the problem. I had to touch some rules for CalDav and CardDav since they both use similar endpoints (remote.php).

Since these changes are fairly big, I tested these changes against older Nextcloud versions and tested this in prod for a while so there shouldn't be any regressions. I added some tests where I could but this isn't an easy part of Nextcloud to add tests for.

Improvements:

• The lines of code has been reduced by about 250
• The number of rules has gone down from 184 to 168
• Rule exclusions for Nextcloud Files are no longer fragmented between File Manager and Nextcloud Files
• Due to the number of rule exclusions for the File Manager, I've split the rules into 3 subcategories, Settings, Web GUI, and file uploads/downloads.
• As a consequence of the refactor, a new false positive introduced in the Nextcloud 31 beta has also been fixed.
• Existing rules should be easier to maintain (Evident by the fix in Nextcloud 31 beta)

[theseion]

Good stuff!