Avoid running regression tests twice
Avoid running regression tests twice

All job parameters are exposed as environment variables, so checking
the RUN_REGRESSION_TESTS box causes them to run twice: once by
`govuk.runTests()` and once by `bundle exec ruby
test/regression/smart_answers_regression_test.rb`

As we explicitly check for and run the regression tests after the
normal tests, never run them during the normal tests.

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