Explore adding branch name to accessible link labels

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@psjakubowska identified an opportunity to improve repository graph link labels by adding branch names in MR 203014.

Adding the branch name should be tested with screen readers and determine if adding this information makes the label announcement too long, or if the added length is valuable.

Success may be adding the branch name where appropriate. Success may also be closing this issue as won't fix because we're happy with the accessible label as.