Update WorkoutPlanEntity to Include 'isActive' Field

[makampos]

• Added isActive field to the WorkoutPlanEntity to track the active status of workout plans.
• Implemented ToggleIsActive method to enable toggling the active status on and off.
• Added API endpoint and corresponding service method ToggleWorkoutPlanActiveAsync for updating the active status via the API.
• Developed unit tests to ensure the functionality of the new method and endpoint.
• Created integration tests to validate the end-to-end behavior of the updated functionality.
• Added migration 20241108144559_AddedIsActiveFieldInWorkoutPlanEntity to update the database schema with the new field.
• Introduced an optional IsActive parameter to the GetWorkoutPlansByUserIdAsync method to allow filtering of workout plans based on their active status.
• Updated unit tests to cover scenarios with the new IsActive parameter.
• Updated integration tests to validate the filtering behavior in real-world scenarios.