Revert "fix(assert-changed-files): don't skip running tests on master (#28400)" (#28408)
Revert "fix(assert-changed-files): don't skip running tests on master (#28400)" (#28408)

This reverts commit 5812c813cb6f74b1965870bbf4671e8fcd51dc9d.
gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby