[ENG-7712] Fix issue with write users editing registration metadata

[futa-ikeda]

• Ticket: ENG-7712
• Feature flag: n/a

Purpose

• Allow write users to update registration metadata without getting yelled at about how "Only admins can edit subjects"

Summary of Changes

• Remove unnecessary setting of node subjects in the subjects manager
  • This was causing the node's subjects to get included into the PATCH request whenever the subjects::manager component was invoked (which wasn't good when a write-user was viewing a page with it)
  • Remove other unneeded logic that was mucking things up

Screenshot(s)

Side Effects

QA Notes

[coveralls]

Pull Request Test Coverage Report for Build 14345867584

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 67.615%

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Totals
Change from base Build 14342884383:	0.02%
Covered Lines:	8466
Relevant Lines:	12041

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💛 - Coveralls