[FLINK-37515] Basic support for Blue/Green deployments #4617

Job	Run time
maven build (17)	22s
maven build (21)	23s
Smoke test (okhttp, 17) / test_application_operations.sh	2m 39s
Smoke test (jdk, 21) / test_application_operations.sh	2m 40s
Smoke test (jetty, 17) / test_application_operations.sh	2m 38s
Smoke test (vertx, 17) / test_application_operations.sh	2m 39s
Smoke test (jdk, 17) / test_application_operations.sh	2m 37s
Smoke test (vertx, 21) / test_application_operations.sh	2m 39s
Smoke test (jetty, 21) / test_application_operations.sh	2m 38s
Smoke test (okhttp, 21) / test_application_operations.sh	2m 24s
e2e_ci	0s
Java runtimes smoke test	0s
Alternative namespace tests	0s
	21m 39s

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