`om health`: Improve tracing message for flake URL #1366

Job	Run time
main (x86_64-linux, true)	2m 12s
main (aarch64-linux, true)	19m 4s
main (aarch64-darwin, true)	2m 22s
main (x86_64-darwin, true)	3m 59s
static-binary-check (ubuntu-latest)	3s
static-binary-check (macos-latest)	5s
website / upload	7s
website / deploy	9s
	28m 1s

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