Refactor Application authenticator retrieving methods in authentication framework.

[Thisara-Welmilla]

Issue:

• Imporve authenticatoin framework execution. product-is#22436

Refactor Application authenticator retrieving methods in authentication framework to support retrieving ApplicationAuthenticators for User defined authenticator configs.

[codecov]

Codecov Report

Attention: Patch coverage is 38.41463% with 101 lines in your changes missing coverage. Please review.

Project coverage is 46.46%. Comparing base (eea8893) to head (500670d).
Report is 51 commits behind head on master.

Files with missing lines	Patch %	Lines
...internal/core/ApplicationAuthenticatorManager.java	66.07%	17 Missing and 2 partials ⚠️
...uthentication/framework/AuthenticationService.java	22.72%	17 Missing ⚠️
.../authentication/framework/util/FrameworkUtils.java	11.76%	15 Missing ⚠️
...ramework/handler/step/impl/DefaultStepHandler.java	18.75%	12 Missing and 1 partial ⚠️
...ework/config/model/OptimizedApplicationConfig.java	0.00%	9 Missing ⚠️
.../framework/internal/FrameworkServiceComponent.java	0.00%	8 Missing ⚠️
...n/framework/cache/AuthenticationContextLoader.java	0.00%	7 Missing ⚠️
...ork/config/model/OptimizedAuthenticatorConfig.java	0.00%	5 Missing ⚠️
...work/config/loader/UIBasedConfigurationLoader.java	66.66%	2 Missing and 2 partials ⚠️
.../config/builder/FileBasedConfigurationBuilder.java	0.00%	2 Missing ⚠️
... and 1 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6365      +/-   ##
============================================
- Coverage     46.77%   46.46%   -0.32%     
+ Complexity    15015    14831     -184     
============================================
  Files          1733     1728       -5     
  Lines        104595   104192     -403     
  Branches      18749    18634     -115     
============================================
- Hits          48925    48410     -515     
- Misses        48702    48889     +187     
+ Partials       6968     6893      -75     

Flag	Coverage Δ
unit	30.26% <38.03%> (-0.06%)	⬇️

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PR builder started
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PR builder completed
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PR builder started
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PR builder completed
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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/12979049463

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PR builder started
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PR builder completed
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[jenkins-is-staging]

PR builder started
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[jenkins-is-staging]

PR builder completed
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Status: failure

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PR builder started
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PR builder completed
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[Thisara-Welmilla]

Prevoius integration builder was passed and later only added unit tests #6365 (review)

Also locally ran those tests and got passed them

[jenkins-is-staging]

PR builder started
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[sonarqubecloud]

Quality Gate passed

Issues
5 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 SonarQube Cloud

[jenkins-is-staging]

PR builder completed
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Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/12984867639