Follow-up from "Merge request title migration" - consolidate branch styles

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The following discussion from !155708 (merged) should be addressed:

• @bsandlin started a discussion:

  suggestion (non-blocking): gl-text-blue-500! dead here as well.

                    class="gl-font-monospace gl-bg-blue-50 gl-rounded-base gl-font-sm gl-px-2 gl-mt-2 gl-truncate gl-max-w-26 gl-ml-2"

  This is out of scope, but I think consolidating the styles for this and the source branch link would be useful so we could just call $options.branchStyles