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chore(test): address review feedback from andreyvelich

- Remove year from Copyright headers in both test files
- Add trailing newline at end of both files
- Fix error message format in TestRuntimeRefIsTrainingRuntime
  to use 'FunctionName(%v) = %v, want %v' pattern for consistency
- Add nil edge cases to TestRuntimeRefIsTrainingRuntime for symmetry
  with TestRuntimeRefIsClusterTrainingRuntime (nil APIGroup, nil Kind,
  both nil, wrong APIGroup)

Signed-off-by: Yugendhar S <yugendhars06@gmail.com>