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.