Auto merge of #18907 - servo:jdm-patch-3, r=SimonSapin
Auto merge of #18907 - servo:jdm-patch-3, r=SimonSapin

Remove duplicate CEF builds

We already run `./mach build-cef` on `mac-dev-unit` and `linux-dev`. These tasks take an extra 20 minutes on some of our longest-running builders, so this is an easy win.

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