Add test case on hpa metrics for flux build/diff

[souleb]

If implemented will detect any change on how ssa dry-run return diffs on hpa metrics

Signed-off-by: Soule BA [email protected]

[stefanprodan]

Can you please add a custom metric to the test:

  metrics:
    - pods:
        metric:
          name: nginx_http_requests_total
        target:
          averageValue: "4"
          type: AverageValue
      type: Pods

This was tripping diff in my tests, when other things change this custom metric gets duplicated in the diff output.