Follow-up from "Upgrade prettier to v1.15.2"

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The following discussion from gitlab-ce!22893 should be addressed:

• @ClemMakesApps started a discussion: (+2 comments)

  Did we intentionally add this regex?

We use replace(/\s\s+/g, ' ') in a lot of places within our frontend tests to normalize text whitespace within DOM nodes prior to trying to match them. We ought to use an existing utility function for this (like trimText in vue_component_helper.js) or a custom jasmine matcher.