Add new method to get federated authenticator by name.

[Thisara-Welmilla]

Issue:

• Imporve authenticatoin framework execution. product-is#22436

Create new method to get the FederatedAuthenticatorByName for both SYSTEM and USER defined users.

[codecov]

Codecov Report

Attention: Patch coverage is 43.75000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 46.41%. Comparing base (f4edfa8) to head (f9d5db7).
Report is 50 commits behind head on master.

Files with missing lines	Patch %	Lines
...cation/common/ApplicationAuthenticatorService.java	0.00%	5 Missing ⚠️
...g/wso2/carbon/idp/mgt/IdentityProviderManager.java	77.77%	2 Missing ⚠️
.../framework/internal/FrameworkServiceComponent.java	0.00%	1 Missing ⚠️
.../main/java/org/wso2/carbon/idp/mgt/IdpManager.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6363      +/-   ##
============================================
+ Coverage     46.33%   46.41%   +0.07%     
- Complexity    14681    14737      +56     
============================================
  Files          1707     1713       +6     
  Lines        103362   103607     +245     
  Branches      18508    18532      +24     
============================================
+ Hits          47895    48085     +190     
- Misses        48627    48672      +45     
- Partials       6840     6850      +10     

Flag	Coverage Δ
unit	30.02% <43.75%> (+0.13%)	⬆️

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[sonarqubecloud]

Quality Gate passed

Issues
2 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 started
Link: https://github.com/wso2/product-is/actions/runs/12966606668

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/12966606668
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/12966606668