Refactor: Move kafka client substitutions under tight package #40975

Job	Run time
Initial JDK 17 Build	11m 17s
Attach pull request number	2s
CI Sanity Check	31s
Calculate Test Jobs	8s
Maven Tests - JDK 17	8m 7s
Maven Tests - JDK 17 Windows	11m 15s
Kubernetes Tests - JDK 17	4m 35s
Gradle Tests - JDK ${{ matrix.java.name }}	0s
Kubernetes Tests - JDK 21	4m 53s
Kubernetes Tests - JDK 17 Windows	2m 54s
JVM Tests - JDK 17	14m 54s
JVM Tests - JDK 21	14m 59s
JVM Tests - JDK 17 Windows	6m 54s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Native Tests - Messaging1	31m 22s
Native Tests - HTTP	7m 15s
Quickstarts Compilation - JDK 17	5m 8s
MicroProfile TCKs Tests	0s
Native Tests - Virtual Thread - Messaging	4m 13s
Build report	26s
	2h 8m 53s

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