Modernize meta-vscode: bump to 1.120, fix per-arch, add multi-release CI #1

Job	Run time
build vscode (scarthgap / qemux86-64)	52m 35s
parse (wrynose / qemux86-64)	2m 48s
parse (wrynose / qemuarm)	3m 51s
parse (wrynose / qemuarm64)	2m 4s
parse (kirkstone / qemux86-64)	1m 41s
parse (scarthgap / qemuarm64)	2m 3s
parse (kirkstone / qemuarm)	3m 34s
parse (styhead / qemux86-64)	1m 50s
parse (scarthgap / qemuarm)	2m 14s
parse (walnascar / qemuarm64)	2m 56s
parse (walnascar / qemux86-64)	3m 39s
parse (styhead / qemuarm64)	2m 10s
parse (scarthgap / qemux86-64)	2m 16s
parse (kirkstone / qemuarm64)	1m 38s
parse (walnascar / qemuarm)	3m 31s
parse (styhead / qemuarm)	2m 3s
	1h 30m 53s

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