fix: wait for pods to be ready before port-forwarding in MetricsHandlingE2E #6322

Job	Run time
check_format_and_unit_tests	1m 26s
build / Special integration tests (25)	2m 15s
build / Special integration tests (21)	2m 7s
build / Special integration tests (17)	2m 13s
build / httpclient-tests (jdk) / Integration tests (25, 1.32.0, jdk)	26m 31s
build / httpclient-tests (vertx) / Integration tests (25, 1.32.0, vertx)	26m 8s
build / integration_tests (25, 1.30.12) / Integration tests (25, 1.30.12, vertx)	26m 5s
build / integration_tests (21, 1.31.8) / Integration tests (21, 1.31.8, vertx)	28m 24s
build / integration_tests (17, 1.32.4) / Integration tests (17, 1.32.4, vertx)	26m 59s
build / integration_tests (17, 1.31.8) / Integration tests (17, 1.31.8, vertx)	27m 38s
build / httpclient-tests (jetty) / Integration tests (25, 1.32.0, jetty)	27m 41s
build / integration_tests (21, 1.32.4) / Integration tests (21, 1.32.4, vertx)	26m 25s
build / integration_tests (17, 1.30.12) / Integration tests (17, 1.30.12, vertx)	26m 4s
build / integration_tests (25, 1.32.4) / Integration tests (25, 1.32.4, vertx)	28m 7s
build / integration_tests (25, 1.31.8) / Integration tests (25, 1.31.8, vertx)	28m 37s
build / integration_tests (21, 1.33.1) / Integration tests (21, 1.33.1, vertx)	28m 23s
build / integration_tests (25, 1.33.1) / Integration tests (25, 1.33.1, vertx)	27m 41s
build / integration_tests (21, 1.30.12) / Integration tests (21, 1.30.12, vertx)	25m 35s
build / integration_tests (17, 1.33.1) / Integration tests (17, 1.33.1, vertx)	27m 44s
	6h 56m 3s

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