[Single file editor] Source branch reference background color isn't using design token

Problem to solve

This issue represents a finding from our work to audit features belonging to groupsource code. See the analysis in Figma for more information. See the overview video for guidance on how to review this analysis.

Proposal

• Address the following finding on the Single file editor page:
  • Source branch reference background color isn't using design token
  • There is an existing Pajamas solution to address this
• Additional notes and guidance to resolve this finding:
  • Background color isn't using a design token. Could the background color be removed? If so, add this as a paper cut.
• Finding yellow #2

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