Fix error message when a REST Client throws an exception #44599

Job	Run time
Attach pull request number	3s
CI Sanity Check	31s
Initial JDK 17 Build	11m 57s
Calculate Test Jobs	12s
JVM Tests - JDK 17	48m 0s
JVM Tests - JDK 21	50m 58s
JVM Tests - JDK 17 Windows	55m 12s
Gradle Tests - JDK ${{ matrix.java.name }}	0s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
Maven Tests - JDK ${{ matrix.java.name }}	0s
Native Tests - Main	2m 0s
Native Tests - Data3	5m 24s
Quickstarts Compilation - JDK 17	7m 50s
MicroProfile TCKs Tests	11m 1s
Native Tests - Data4	5m 16s
Native Tests - Messaging1	22m 0s
Native Tests - Security2	9m 13s
Native Tests - Virtual Thread - Main	3m 51s
Native Tests - Security3	6m 16s
Native Tests - Cache	11m 19s
Native Tests - Virtual Thread - Messaging	10m 58s
Native Tests - HTTP	24m 45s
Native Tests - Misc1	5m 33s
Native Tests - Misc3	6m 51s
Native Tests - Misc4	8m 34s
Native Tests - gRPC	5m 55s
Upload build stats to collector	0s
Build report	33s
	5h 14m 12s

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