Fix Undefined baseUrl and origin in API Service Test

[Shweta-281]

Description

This PR resolves compilation errors in api_service_test.dart by defining the missing baseUrl and origin constants. These changes ensure the test suite runs successfully and paves the way for future configuration improvements.

Fixes #479

Changes

• Added baseUrl and origin constants to api_service_test.dart.
• Updated the fetchTasks test to use the new constants.

Testing

• Verified that tests pass locally.
• Confirmed no regressions in API interaction logic.

Notes

• Placeholder values (your-api-base-url.com, your-application-origin) should be replaced with actual values in collaboration with maintainers.
• A follow-up issue (Bug: Undefined baseUrl and origin Constants in API Service Test #479 ) has been created to centralize configuration.

Checklist

• Tests have been added or updated to cover the changes
• Documentation has been updated to reflect the changes
• Code follows the established coding style guidelines
• All tests are passing