Update the group last modified date when updating a group [when unique group id is disabled]

[ThaminduDilshan]

Purpose

When a group is modified by renaming it's display name, adding a user to the group or removing an user from the group, the group last modified date needs to be updated. This PR fixes that issue by updating the group last modified date on such scenarios.

Note: The SCIM level update is only required when the group unique id feature is disabled. Otherwise the attributes will be stored in the user store.

Goals

Update the group modified time when adding/ removing a user to/ from a group.

Related Issue

• lastModified attribute of the groups does not update wso2/product-is#19244

Related PRs

• Update the group last modified date on group update [when unique group id is enabled] wso2/carbon-kernel#4168

[codecov]

Codecov Report

Attention: Patch coverage is 97.43590% with 1 line in your changes missing coverage. Please review.

Project coverage is 47.52%. Comparing base (1dfc576) to head (0372bcc).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
...on/identity/scim2/common/impl/SCIMUserManager.java	96.55%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #590      +/-   ##
============================================
+ Coverage     40.60%   47.52%   +6.92%     
- Complexity      874     1026     +152     
============================================
  Files            41       41              
  Lines         10518     9016    -1502     
  Branches       2659     2286     -373     
============================================
+ Hits           4271     4285      +14     
+ Misses         5309     3805    -1504     
+ Partials        938      926      -12     

Flag	Coverage Δ
unit	32.99% <97.43%> (+2.67%)	⬆️

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PR builder started
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PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/12596878387
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[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/12596878387