Feat: Add unit tests for GetGoalsForUser endpoint

[ronaldfarnandis]

Summary

This pull request introduces unit test coverage for the GetGoalsForUser method in the GoalController. Adding these tests ensures the endpoint behaves as expected and prevents future regressions.

Changes Made

• Added a test case to verify a 200 OK response is returned when a user with existing goals is requested.
• Added a test case to verify a 404 Not Found response is returned when the service cannot find a user or their goals.

How to Verify

All new and existing tests in the suite pass successfully.

[gitguardian]

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