Add OrganizationUserSharingHandler for post orgaization creation event.

[Yasasr1]

Reverts #6384

Note: Should run the integration tests and merge after the following prs are merged

• Get a new sub-listed ancestor organization list without modifying the original list. wso2-extensions/identity-organization-management#438
• Bump identity-org-mgt version. product-is#22518

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/12987168274

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.55%. Comparing base (97d2cbf) to head (7ecc88e).
Report is 204 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6389      +/-   ##
============================================
+ Coverage     45.83%   46.55%   +0.71%     
+ Complexity    15127    14917     -210     
============================================
  Files          1736     1736              
  Lines        107598   104613    -2985     
  Branches      19666    19110     -556     
============================================
- Hits          49320    48700     -620     
+ Misses        51246    48998    -2248     
+ Partials       7032     6915     -117     

Flag	Coverage Δ
unit	30.29% <ø> (+0.03%)	⬆️

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[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/12987168274
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/12987168274