Handle authentication when no local account is linked

[ThaminduR]

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

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migrations, software that we need to install on staging and production
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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.

[sonarcloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

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

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 2.45902% with 119 lines in your changes missing coverage. Please review.

Project coverage is 40.60%. Comparing base (374f0f9) to head (27751f1).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...t/impl/PostAuthAssociationVerificationHandler.java	0.00%	46 Missing ⚠️
...impl/JITProvisioningPostAuthenticationHandler.java	9.09%	28 Missing and 2 partials ⚠️
.../authentication/framework/util/FrameworkUtils.java	0.00%	27 Missing ⚠️
...ndler/request/impl/PostAuthAssociationHandler.java	0.00%	9 Missing and 1 partial ⚠️
...framework/exception/ErrorToI18nCodeTranslator.java	0.00%	4 Missing ⚠️
.../framework/internal/FrameworkServiceComponent.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6082      +/-   ##
============================================
- Coverage     40.64%   40.60%   -0.05%     
  Complexity    14459    14459              
============================================
  Files          1763     1764       +1     
  Lines        117814   117930     +116     
  Branches      19034    19056      +22     
============================================
- Hits          47881    47880       -1     
- Misses        62643    62757     +114     
- Partials       7290     7293       +3     

Flag	Coverage Δ
unit	24.82% <2.45%> (-0.03%)	⬇️

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