Cache certificate files in specs

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The following discussion from gitlab-ce!31169 should be addressed:

• @hfyngvason started a discussion:

  As I'm also sad to see the extra performance gains vanish, would caching these win you back the last bits of performance? We could read them into constants as so

  SAMPLE_KEY = File.read(Rails.root.join('spec/fixtures/clusters/sample_key.key')
  SAMPLE_CERT = File.read(Rails.root.join('spec/fixtures/clusters/sample_cert.pem')

  or maybe extend e.g. FixtureHelpers with something like

  def memoized_fixture_file(*args)
    FixtureHelpers.fixture_cache[*args] ||= fixture_file(*args)
  end
  
  def self.fixture_cache
    @fixture_cache ||= {}
  end