Add a "status" API to DiagnosticContext, overhaul Downloads console o… #453

Job	Run time
builds / build (windows-2022, windows-ci)	43m 52s
builds / build (ubuntu-20.04, linux-ci)	20m 34s
builds / build (macos-13, macos-ci)	36m 37s
	1h 41m 3s

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