Allow repository ADMIN to update RepositoryMetadata

[minwoox]

Motivation:
A repository ADMIN should have the ability to update the repository's RepositoryMetadata for better access control.

Modifications:

• Updated MetadataApiService to allow a repository ADMIN to modify the corresponding repository's RepositoryMetadata.

Result:

• Repository ADMIN users can now update RepositoryMetadata.

[trustin]

👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.18%. Comparing base (767eff3) to head (e4a68e7).
Report is 13 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1116      +/-   ##
============================================
+ Coverage     70.07%   70.18%   +0.10%     
- Complexity     4486     4503      +17     
============================================
  Files           453      452       -1     
  Lines         18161    18370     +209     
  Branches       2008     2031      +23     
============================================
+ Hits          12727    12893     +166     
- Misses         4345     4385      +40     
- Partials       1089     1092       +3     

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