test-renderers: log time taken by the UI test rendering steps. #638

Job	Run time
deny	42s
incremental-mutants	0s
miri	1m 53s
build (ubuntu, stable, locked, true)	17m 19s
build (windows, stable, locked, false)	25m 0s
no_std	30s
build (macos, stable, locked, false)	15m 9s
build (ubuntu, nightly, locked, false)	22m 1s
build (ubuntu, beta, locked, false)	22m 13s
build (ubuntu, stable, latest, false)	15m 54s
build (ubuntu, stable, minimal, false)	1m 22s
features	29m 27s
fuzz	16m 31s
deploy	5s
	2h 48m 6s

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