Implement Resolving Shared User Profiles in Token and Userinfo Endpoints

[dhaura]

Proposed changes in this pull request

• $Subject

When should this PR be merged

[Please describe any preconditions that need to be addressed before we
can merge this pull request.]

Follow up actions

[List any possible follow-up actions here; for instance, testing data
migrations, software that we need to install on staging and production
environments.]

Checklist (for reviewing)

General

• Is this PR explained thoroughly? All code changes must be accounted for in the PR description.
• Is the PR labeled correctly?

Functionality

• Are all requirements met? Compare implemented functionality with the requirements specification.
• Does the UI work as expected? There should be no Javascript errors in the console; all resources should load. There should be no unexpected errors. Deliberately try to break the feature to find out if there are corner cases that are not handled.

Code

• Do you fully understand the introduced changes to the code? If not ask for clarification, it might uncover ways to solve a problem in a more elegant and efficient way.
• Does the PR introduce any inefficient database requests? Use the debug server to check for duplicate requests.
• Are all necessary strings marked for translation? All strings that are exposed to users via the UI must be marked for translation.

Tests

• Are there sufficient test cases? Ensure that all components are tested individually; models, forms, and serializers should be tested in isolation even if a test for a view covers these components.
• If this is a bug fix, are tests for the issue in place? There must be a test case for the bug to ensure the issue won’t regress. Make sure that the tests break without the new code to fix the issue.
• If this is a new feature or a significant change to an existing feature? has the manual testing spreadsheet been updated with instructions for manual testing?

Security

• Confirm this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.
• Are all UI and API inputs run through forms or serializers?
• Are all external inputs validated and sanitized appropriately?
• Does all branching logic have a default case?
• Does this solution handle outliers and edge cases gracefully?
• Are all external communications secured and restricted to SSL?

Documentation

• Are changes to the UI documented in the platform docs? If this PR introduces new platform site functionality or changes existing ones, the changes should be documented.
• Are changes to the API documented in the API docs? If this PR introduces new API functionality or changes existing ones, the changes must be documented.
• Are reusable components documented? If this PR introduces components that are relevant to other developers (for instance a mixin for a view or a generic form) they should be documented in the Wiki.

[codecov]

Codecov Report

Attention: Patch coverage is 13.88889% with 31 lines in your changes missing coverage. Please review.

Project coverage is 55.99%. Comparing base (10badb9) to head (0cb7e28).
Report is 15 commits behind head on master.

Files with missing lines	Patch %	Lines
...carbon/identity/oauth/endpoint/util/ClaimUtil.java	20.00%	14 Missing and 2 partials ⚠️
...2/carbon/identity/openidconnect/OIDCClaimUtil.java	6.25%	14 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2599      +/-   ##
============================================
- Coverage     56.22%   55.99%   -0.24%     
+ Complexity     8120     8114       -6     
============================================
  Files           632      632              
  Lines         46113    46335     +222     
  Branches       7540     7586      +46     
============================================
+ Hits          25927    25944      +17     
- Misses        16468    16666     +198     
- Partials       3718     3725       +7     

Flag	Coverage Δ
unit	38.68% <13.88%> (-0.02%)	⬇️

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[Thumimku]

Hi @dhaura,

⚠️ Notice: This PR has been open for a while. To keep the repository clean and up-to-date, this PR will be closed within the next two weeks if there is no further activity.

Please take one of the following actions:

• Merge the PR if it is ready.
• Close the PR if it is no longer relevant.
• Leave a comment explaining why it should remain open and provide an update on its progress.

Your prompt attention to this matter is greatly appreciated. Thank you for your understanding and collaboration! 🙏