refactor: avoid creating intermediate collections when unneeded #6063

Job	Run time
check_format_and_unit_tests	1m 20s
build / Special integration tests (17)	2m 10s
build / Special integration tests (21)	2m 18s
build / Special integration tests (25)	2m 3s
build / httpclient-tests (jdk) / Integration tests (25, 1.32.0, jdk)	25m 48s
build / integration_tests (25, 1.33.1) / Integration tests (25, 1.33.1, vertx)	26m 4s
build / httpclient-tests (vertx) / Integration tests (25, 1.32.0, vertx)	26m 9s
build / integration_tests (17, 1.30.12) / Integration tests (17, 1.30.12, vertx)	25m 4s
build / integration_tests (25, 1.31.8) / Integration tests (25, 1.31.8, vertx)	26m 33s
build / integration_tests (21, 1.32.4) / Integration tests (21, 1.32.4, vertx)	27m 3s
build / httpclient-tests (jetty) / Integration tests (25, 1.32.0, jetty)	25m 17s
build / integration_tests (25, 1.30.12) / Integration tests (25, 1.30.12, vertx)	24m 46s
build / integration_tests (25, 1.32.4) / Integration tests (25, 1.32.4, vertx)	26m 31s
build / integration_tests (21, 1.31.8) / Integration tests (21, 1.31.8, vertx)	27m 1s
build / integration_tests (17, 1.33.1) / Integration tests (17, 1.33.1, vertx)	27m 3s
build / integration_tests (17, 1.31.8) / Integration tests (17, 1.31.8, vertx)	27m 34s
build / integration_tests (21, 1.30.12) / Integration tests (21, 1.30.12, vertx)	25m 0s
build / integration_tests (17, 1.32.4) / Integration tests (17, 1.32.4, vertx)	25m 59s
build / integration_tests (21, 1.33.1) / Integration tests (21, 1.33.1, vertx)	26m 34s
	6h 40m 17s

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