fix: ensure istio sidecar is killed if job fails #3262

Job	Run time
lint-check	40s
Select Jobs	2s
Schedule (all, registry1, install) / Test	15m 51s
Schedule (all, registry1, upgrade) / Test	21m 26s
Schedule (all, unicorn, install) / Test	15m 4s
Schedule (all, unicorn, upgrade) / Test	23m 9s
Schedule (all, upstream, install) / Test	15m 42s
Schedule (all, upstream, upgrade) / Test	20m 36s
Compliance Evaluation (upstream) / Evaluate	26s
Compliance Evaluation (unicorn) / Evaluate	32s
Compliance Evaluation (registry1) / Evaluate	25s
	1h 53m 53s

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