Bridges testing improvements #14458

Job	Run time
preflight / preflight	40s
preflight / ci-versions	1m 5s
test-linux-stable-int	9m 41s
test-linux-stable (1/3, parity-large)	33m 55s
test-linux-stable-runtime-benchmarks	27m 28s
test-linux-stable-no-try-runtime (1/2)	33m 53s
test-linux-stable (1/3, parity-oldlinux)	34m 18s
test-linux-stable-no-try-runtime (2/2)	24m 27s
test-linux-stable (2/3, parity-large)	23m 32s
test-linux-stable (2/3, parity-oldlinux)	18m 56s
test-linux-stable (3/3, parity-large)	23m 10s
test-linux-stable (3/3, parity-oldlinux)	18m 10s
All tests passed	1s
	4h 9m 16s

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