Improve shutdown of VertxHttpExporter and VertxGrpcExporter #38066

Job	Run time
CI Sanity Check	31s
Attach pull request number	2s
Initial JDK 17 Build	10m 33s
Calculate Test Jobs	12s
JVM Tests - JDK 17	33m 24s
JVM Tests - JDK 21	33m 20s
JVM Tests - JDK 17 Windows	33m 28s
Gradle Tests - JDK ${{ matrix.java.name }}	0s
Maven Tests - JDK ${{ matrix.java.name }}	0s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
Quickstarts Compilation - JDK 17	6m 17s
Native Tests - Main	7m 1s
MicroProfile TCKs Tests	3m 9s
Native Tests - Data4	6m 0s
Native Tests - Messaging1	20m 33s
Native Tests - Virtual Thread - ${{ matrix.category }}	0s
Native Tests - Security2	6m 44s
Native Tests - Cache	6m 42s
Native Tests - HTTP	16m 38s
Native Tests - Misc3	5m 43s
Native Tests - Misc4	17m 50s
Native Tests - gRPC	5m 27s
Build report	25s
	3h 33m 59s

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