Add unit test coverage for GetForUser goal controller route

[1Dhairyak]

Summary

Adds xUnit test coverage for the GetForUser endpoint on GoalController, completing the test cases for goal retrieval by user.

Changes

• Implemented the previously empty GetForUser test in GoalControllerTests.cs
• Test verifies that goals returned for a given user ID match expected Id and Name values, following the existing pattern used in GetAll and Get
• Verified with dotnet test: 11/11 tests passing, no regressions

Testing

Ran dotnet test locally — all tests pass.

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