`om ci`: Add devour-flake output path in result JSON #1396

Job	Run time
main (x86_64-linux, false)	3m 48s
main (aarch64-darwin, false)	6m 18s
website	0s
static-binary-check (ubuntu-latest)	3s
static-binary-check (macos-latest)	5s
	10m 14s

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