feat: Implement Enterprise SCIM - Update Group & User attributes

[elminster-aom]

Related with #3813

From REST API endpoints for Enterprise SCIM docs, implements:

• Update attributes for a SCIM enterprise group, PATCH /scim/v2/enterprises/{enterprise}/Groups/{scim_group_id}

• Update attributes for a SCIM enterprise user, PATCH /scim/v2/enterprises/{enterprise}/Users/{scim_user_id}

Other changes:

• Minor improvements for previous SCIM enterprise unit tests code.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.46%. Comparing base (b480d82) to head (e2c8914).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3848      +/-   ##
==========================================
+ Coverage   92.45%   92.46%   +0.01%     
==========================================
  Files         199      199              
  Lines       14218    14240      +22     
==========================================
+ Hits        13145    13167      +22     
  Misses        884      884              
  Partials      189      189              

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[gmlewis]

Thank you, @elminster-aom!
Just a few minor tweaks, please, then we should be ready for a second LGTM+Approval from any other contributor to this repo before merging.

cc: @stevehipwell - @alexandear - @zyfy29

[gmlewis]

Thank you, @elminster-aom and @alexandear!
LGTM.
Merging.