Refactor Configuration Validation to Use assertParamExists for apiUrl Check

[Waheedsys]

Provide a brief summary of the changes

• Ensured consistent error handling for missing apiUrl, maintaining backward compatibility with apiScheme and apiHost.
• Simplified the validation logic for cleaner and more reusable code.

Description

Provide a detailed description of the changes

This PR refactors the validation logic in the Configuration class to improve error handling for the apiUrl parameter. The changes ensure consistent validation across parameters (apiUrl, apiScheme, and apiHost) and improve readability and maintainability by using the assertParamExists utility function.

References

Review Checklist

• [ ] I have clicked on "allow edits by maintainers".
• [ ] I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• [ ] The correct base branch is being used, if not main
• [ ] I have added tests to validate that the change in functionality is working as expected

[linux-foundation-easycla[bot]]

• :white_check_mark:login: Waheedsys / (c4a69b22730a22b057578ccdaaa8d581abc156e6)
• :white_check_mark:login: Waheedsys / (c4a69b22730a22b057578ccdaaa8d581abc156e6, efb24003510f638c8ce6b5a1c25db3178234b419)
• :white_check_mark:login: Waheedsys / (c4a69b22730a22b057578ccdaaa8d581abc156e6, efb24003510f638c8ce6b5a1c25db3178234b419, 435c8c1a34e53f910bd180fb4c22d418da74fc5e)
• :white_check_mark:login: Waheedsys / (c4a69b22730a22b057578ccdaaa8d581abc156e6, efb24003510f638c8ce6b5a1c25db3178234b419, 435c8c1a34e53f910bd180fb4c22d418da74fc5e, 93a7cbecc5104dd582da852a5d8a3bebf5ec5ecc)

The committers listed above are authorized under a signed CLA.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.93%. Comparing base (10534cc) to head (93a7cbe). Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
- Coverage   87.94%   87.93%   -0.02%     
==========================================
  Files          23       23              
  Lines        1120     1119       -1     
  Branches      171      171              
==========================================
- Hits          985      984       -1     
  Misses         83       83              
  Partials       52       52              

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