Improve nextjs tests flakyness #12778

Job	Run time
get-essential-scenarios	4s
parametric	8m 0s
system-tests (express4, DEFAULT)	2m 33s
system-tests (express4, APPSEC_BLOCKING)	2m 5s
system-tests (express4, APPSEC_API_SECURITY_RC)	2m 7s
system-tests (express4, REMOTE_CONFIG_MOCKED_BACKEND_ASM_FEATURES)	3m 41s
system-tests (express4, INTEGRATIONS)	4m 21s
system-tests (express4, CROSSED_TRACING_LIBRARIES)	6m 2s
system-tests (express4-typescript, DEFAULT)	2m 45s
system-tests (express4-typescript, APPSEC_BLOCKING)	1m 54s
system-tests (express4-typescript, APPSEC_API_SECURITY_RC)	1m 52s
system-tests (express4-typescript, REMOTE_CONFIG_MOCKED_BACKEND_ASM_FEATURES)	3m 45s
system-tests (express4-typescript, INTEGRATIONS)	5m 7s
system-tests (express4-typescript, CROSSED_TRACING_LIBRARIES)	5m 57s
system-tests (nextjs, DEFAULT)	6m 7s
system-tests (nextjs, APPSEC_BLOCKING)	2m 47s
system-tests (nextjs, APPSEC_API_SECURITY_RC)	2m 31s
system-tests (nextjs, REMOTE_CONFIG_MOCKED_BACKEND_ASM_FEATURES)	4m 16s
system-tests (nextjs, INTEGRATIONS)	5m 0s
system-tests (nextjs, CROSSED_TRACING_LIBRARIES)	6m 28s
	1h 17m 22s

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