.gitlab-ci builds stage1:exe:ghc-bin before the binary-dist target

CI builds stage1:exe:ghc-bin before the binary-dist target which introduces some quite bad linearisation (see #22093 (closed)) because we don't build stage0 compiler in parallel with anything. Then when the binary-dist target is started we have to build stage1:exe:ghc-pkg before doing anything in there.

I am not sure why we are building stage1:exe:ghc-bin first? cc @bgamari

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