fix: wait for pods to be ready before port-forwarding in MetricsHandlingE2E #6313

Job	Run time
check_format_and_unit_tests	20s
build / Special integration tests (17)	1m 3s
build / Special integration tests (21)	1m 4s
build / Special integration tests (25)	1m 4s
build / httpclient-tests (jetty) / Integration tests (25, 1.32.0, jetty)	57s
build / httpclient-tests (vertx) / Integration tests (25, 1.32.0, vertx)	57s
build / httpclient-tests (jdk) / Integration tests (25, 1.32.0, jdk)	56s
build / integration_tests (21, 1.31.8) / Integration tests (21, 1.31.8, vertx)	56s
build / integration_tests (17, 1.30.12) / Integration tests (17, 1.30.12, vertx)	57s
build / integration_tests (25, 1.33.1) / Integration tests (25, 1.33.1, vertx)	57s
build / integration_tests (21, 1.33.1) / Integration tests (21, 1.33.1, vertx)	56s
build / integration_tests (25, 1.30.12) / Integration tests (25, 1.30.12, vertx)	57s
build / integration_tests (17, 1.31.8) / Integration tests (17, 1.31.8, vertx)	56s
build / integration_tests (25, 1.32.4) / Integration tests (25, 1.32.4, vertx)	57s
build / integration_tests (21, 1.32.4) / Integration tests (21, 1.32.4, vertx)	56s
build / integration_tests (25, 1.31.8) / Integration tests (25, 1.31.8, vertx)	56s
build / integration_tests (17, 1.32.4) / Integration tests (17, 1.32.4, vertx)	56s
build / integration_tests (17, 1.33.1) / Integration tests (17, 1.33.1, vertx)	57s
build / integration_tests (21, 1.30.12) / Integration tests (21, 1.30.12, vertx)	56s
	17m 38s

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