Fix authentication flow with custom authentication extension.

[Thisara-Welmilla]

Issue:

• Fix issues in authentication execution flow with custom authentication extension. product-is#22715

Fix following issue:

1. When the basic authenticator is engaged in the authentication flow, the handleRequest method for the basic authenticator is automatically triggered at the start, setting setCurrentAuthenticator to the basic authenticator. However, when the user provides a username and password, the handleResponse method is initiated, and at line [1], setCurrentAuthenticator is reset to null. Consequently, when selecting the appropriate authenticator, the system iterates through the list of authenticators in the step and checks if currentAuthenticator is null. As a result, the first authenticator in the step always gets selected.
2. As the UserDefinedAuthenticatorEndpointConfig is not extended Serializable, when trying load the authenticator config from the context cache, there is an error ocurred. This UserDefinedAuthenticatorEndpointConfig does not required in the authentication flow, therefore skip adding that attribute of the localAuthenticator to cache.

[1].

carbon-identity-framework/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/handler/request/impl/DefaultRequestCoordinator.java

Line 350 in 5938f4d

context.setCurrentAuthenticator(null);

[2].

carbon-identity-framework/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/handler/step/impl/DefaultStepHandler.java

Line 672 in 5938f4d

&& (context.getCurrentAuthenticator() == null || authenticator.getName()

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 47.15%. Comparing base (b78d6ad) to head (567f681).
Report is 33 commits behind head on master.

Files with missing lines	Patch %	Lines
...ramework/handler/step/impl/DefaultStepHandler.java	0.00%	7 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6416      +/-   ##
============================================
+ Coverage     45.99%   47.15%   +1.16%     
+ Complexity    15457    15234     -223     
============================================
  Files          1744     1745       +1     
  Lines        110303   105383    -4920     
  Branches      20091    19274     -817     
============================================
- Hits          50729    49695    -1034     
+ Misses        52307    48653    -3654     
+ Partials       7267     7035     -232     

Flag	Coverage Δ
unit	30.52% <0.00%> (+0.16%)	⬆️

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[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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Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/13110804129