Don't try to run database helpers as specs

What does this MR do and why?

Running

  $ bin/rspec -Ispec -rspec_helper --color --format documentation \
      spec/support/helpers/database
    Finished in 14.61 seconds (files took 55.56 seconds to load)
    0 examples, 0 failures

has no effect.

Stumbled upon during !71373.

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