Register the application templates API under the application view scope

[DilshanSenarath]

Purpose

Usable application templates were introduced to the extension management API as part of the SSO templates onboarding feature. However, the applications feature requires the internal_extensions_view scope to retrieve application templates from the extension management API. Adding this scope to the applications feature would necessitate a console role migration, as it cannot be implemented in a backward-compatible manner for the UI.

To address this, this PR registers the application templates endpoint as a separate API with the internal_application_mgt_view scope, allowing application templates to be extracted without requiring additional scopes. Other templates in the extension management API will still be accessed using the internal_extensions_view scope to maintain backward compatibility.

Additionally, this PR removes the previously added internal_extensions_view scope for applications feature, as it is no longer needed. Application templates can now be accessed using the internal_application_mgt_view scope.

Related Issue

• [IS-7.1 Migration] Add the missing scopes to enable access to the application management feature product-is#21146

[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

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.70%. Comparing base (f70492e) to head (46173bf).
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##             master    #6244    +/-   ##
==========================================
  Coverage     45.69%   45.70%            
+ Complexity    14078    14059    -19     
==========================================
  Files          1633     1633            
  Lines        100914   100656   -258     
  Branches      17730    17696    -34     
==========================================
- Hits          46117    46004   -113     
+ Misses        48080    47956   -124     
+ Partials       6717     6696    -21     

Flag	Coverage Δ
unit	28.40% <ø> (+<0.01%)	⬆️

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Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/12575841749