diagnostics_channel: add WindowChannel and scopes #3035

Job	Run time
Build slim tarball	1m 41s
aarch64-darwin: with shared libraries	2h 33m 30s
x86_64-darwin: with shared libraries	1h 34m 24s
x86_64-linux: with shared libraries	2h 3m 37s
aarch64-linux: with shared libraries	1h 24m 37s
	7h 37m 49s

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