Move language switch observance of glm_source to SaaS only

Doug Stullrequested to merge
491259-move-to-saas into master

What does this MR do and why?

Move language switch observance of glm_source to SaaS only

  • only valid to use from our marketing site where we provide the glm_source parameter to GitLab.com.

  • move to ee and then guard with SaaS only check.

  • resolve various rubocop offenses

  • see #491259 (closed)

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Related to #491259 (closed)

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