MBS-14225: Add validation and update cleanup for mora.jp links

[SuperSaltyGamer]

Implementation for MBS-14225

Description

• Implemented validation for Mora link type against MusicBrainz entity type.
• Implemented artist link cleanup. Previously artist links were not cleaned up at all due to the hardcoded "/package/" segment in the regex.
• Implemented track link cleanup. Previously track links were cleaned up as release links making them invalid for recordings.

Testing

Added artist and track entries to URLCleanup.js tests, otherwise tested manually on artist, recording and release pages.

Further action

As also mentioned in the ticket, there are some unnormalized/incorrect links already in the database that should be dealt with.

Total unnormalized artist and release links: ~500
Total incorrect artist links: ~50
Total incorrect recording links: ~150

Artist links can easily be manually updated, but release and recording links are more tricky. It also seems like most if not all recording links added so far are incorrect.

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[reosarevok]

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