fix: wait for pods to be ready before port-forwarding in MetricsHandlingE2E #6335

Job	Run time
check_format_and_unit_tests	1m 39s
build / Special integration tests (17)	2m 19s
build / Special integration tests (25)	2m 10s
build / Special integration tests (21)	2m 40s
build / httpclient-tests (jdk) / Integration tests (25, 1.32.0, jdk)	28m 1s
build / httpclient-tests (vertx) / Integration tests (25, 1.32.0, vertx)	26m 50s
build / httpclient-tests (jetty) / Integration tests (25, 1.32.0, jetty)	26m 27s
build / integration_tests (25, 1.30.12) / Integration tests (25, 1.30.12, vertx)	26m 2s
build / integration_tests (21, 1.30.12) / Integration tests (21, 1.30.12, vertx)	26m 15s
build / integration_tests (17, 1.33.1) / Integration tests (17, 1.33.1, vertx)	27m 17s
build / integration_tests (25, 1.31.8) / Integration tests (25, 1.31.8, vertx)	27m 33s
build / integration_tests (21, 1.32.4) / Integration tests (21, 1.32.4, vertx)	27m 14s
build / integration_tests (17, 1.31.8) / Integration tests (17, 1.31.8, vertx)	27m 42s
build / integration_tests (21, 1.33.1) / Integration tests (21, 1.33.1, vertx)	27m 34s
build / integration_tests (17, 1.30.12) / Integration tests (17, 1.30.12, vertx)	26m 17s
build / integration_tests (25, 1.32.4) / Integration tests (25, 1.32.4, vertx)	27m 28s
build / integration_tests (21, 1.31.8) / Integration tests (21, 1.31.8, vertx)	27m 52s
build / integration_tests (17, 1.32.4) / Integration tests (17, 1.32.4, vertx)	26m 20s
build / integration_tests (25, 1.33.1) / Integration tests (25, 1.33.1, vertx)	27m 21s
	6h 55m 1s

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