Add default configs for internal_notification_sending feature

[JayaShakthi97]

$subject

Related issue

• Need to re-evaluate the positioning of Internal Notification Sending feature product-is#21223

[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 45.67%. Comparing base (9dbc3dd) to head (4ed71a7).
Report is 81 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6236   +/-   ##
=========================================
  Coverage     45.67%   45.67%           
+ Complexity    14056    14047    -9     
=========================================
  Files          1632     1632           
  Lines        100532   100532           
  Branches      17629    17629           
=========================================
  Hits          45918    45918           
  Misses        47925    47925           
  Partials       6689     6689           

Flag	Coverage Δ
unit	28.29% <ø> (-0.01%)	⬇️

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PR builder started
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PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/12425809809
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PR builder started
Link: https://github.com/wso2/product-is/actions/runs/12591780269

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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/12591780269