mirror: retry the completeness gate's GETs, and report the status it saw #1108

Job	Run time
windows→linux cross-build (windows host)	8m 37s
mingw-cross linux→windows (build + wine run)	5m 34s
cross-build aarch64-linux-musl (mcpp + xlings)	9m 30s
windows→linux artefact really runs (linux)	6s
	23m 47s

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