Fix khttp client instrumentation #3928

Job	Run time
generate-metadata	2m 9s
build	7m 3s
test-latest-deps	7m 10s
shellcheck	4s
setup-muzzle-matrix	2m 9s
check-links / link-check	9s
smoke-test (ubuntu-24.04, tomcat)	6m 4s
smoke-test (ubuntu-24.04, glassfish)	9m 50s
license-check	2m 14s
smoke-test (ubuntu-24.04, jboss)	3m 51s
smoke-test (ubuntu-24.04, weblogic)	4m 28s
smoke-test (ubuntu-24.04, liberty)	16m 56s
smoke-test (ubuntu-24.04, profiler)	14m 26s
smoke-test (ubuntu-24.04, other)	6m 44s
smoke-test (ubuntu-24.04, wildfly)	12m 52s
smoke-test (ubuntu-24.04, tomee)	6m 44s
smoke-test (ubuntu-24.04, websphere)	6m 20s
smoke-test (ubuntu-24.04, jetty)	8m 27s
muzzle (:instrumentation:websphere)	2m 41s
muzzle (:instrumentation:liberty)	2m 42s
muzzle (:instrumentation:wildfly)	2m 45s
muzzle (:instrumentation:jetty)	2m 39s
muzzle (:instrumentation:khttp)	2m 38s
muzzle (:instrumentation:tomcat)	2m 43s
muzzle (:instrumentation:jdbc)	2m 47s
muzzle (:instrumentation:nocode)	2m 40s
muzzle (:instrumentation:weblogic)	2m 38s
	2h 21m 53s

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