Auto merge of #22450 - servo:multi, r=jdm
Auto merge of #22450 - servo:multi, r=jdm

One Treeherder page for all try-related branches

This will be effective at https://treeherder.allizom.org/#/jobs?repo=servo-try once https://github.com/mozilla/treeherder/pull/4371 lands, and at https://treeherder.mozilla.org/#/jobs?repo=servo-try after it is deployed.

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