[mcocdawc]

Runs the HPC legs on a pull request only with the label run-hpc-ci (adding it later starts them) or waives them with hpc-ci-not-needed, and reports them under their own required status ci-result/hpc-atos instead of ci-result. Needs ecmwf/ci-infrastructure#210; branched from #91, whose commits show here until it merges.

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[mcocdawc]

Combined into #91.