[refactor] Revise HttpClient creation and caching. #8394

Job	Run time
windows-latest integration (Java 21)	8m 45s
ubuntu-latest integration (Java 21)	12m 36s
macOS-latest integration (Java 21)	13m 17s
License check	29s
ubuntu-latest unit (Java 21)	11m 4s
Dependency checks	-8s
	46m 3s

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