Add new config to define default scopes

[AnjanaSamindraPerera]

Purpose

With this PR, we introduced the below config to add default scopes.

[oauth]
default_requested_scopes = ["default", "scope1"]

Here we use those config values to resolve scope validation failure with custom scope validators.

Related Issue

wso2/product-is#22234

[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

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/13067934306

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.04%. Comparing base (9257399) to head (85713bf).
Report is 62 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6410      +/-   ##
============================================
- Coverage     47.05%   47.04%   -0.01%     
+ Complexity    15190    15172      -18     
============================================
  Files          1744     1744              
  Lines        105074   105005      -69     
  Branches      18879    18869      -10     
============================================
- Hits          49441    49402      -39     
+ Misses        48610    48581      -29     
+ Partials       7023     7022       -1     

Flag	Coverage Δ
unit	30.37% <ø> (+<0.01%)	⬆️

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[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/13067934306
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/13067934306