Add unit tests for GetGoalsForUser endpoint

[Ekaaanshhhh]

This pull request adds unit tests for the GetGoalsForUser endpoint in GoalController using xUnit.

Changes made:

• Implemented tests in GoalControllerTests.cs
• Verified that goals are returned correctly for a valid user
• Ensured the controller returns Goal objects as expected

These tests improve backend test coverage and validate the functionality of the GetGoalsForUser route.

[gitguardian]

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