QuarkusUnitTest: fix ignored overrideConfigKey() #1776

Job	Run time
CI Sanity Check	31s
Initial JDK 17 Build	15m 23s
Attach pull request number	0s
Calculate Test Jobs	14s
Gradle Tests - JDK 17	34m 3s
Gradle Tests - JDK 17 Windows	1h 0m 49s
Devtools Tests - JDK 17	13m 27s
Kubernetes Tests - JDK 17	12m 22s
Devtools Tests - JDK 21	12m 48s
JVM Tests - JDK 17	1h 49m 30s
Kubernetes Tests - JDK 21	11m 35s
Devtools Tests - JDK 17 Windows	20m 9s
Maven Tests - JDK 17	59m 25s
JVM Tests - JDK 21	1h 48m 53s
Kubernetes Tests - JDK 17 Windows	18m 58s
Maven Tests - JDK 17 Windows	1h 22m 8s
JVM Tests - JDK 17 Windows	1h 49m 39s
Quickstarts Compilation - JDK 17	7m 42s
MicroProfile TCKs Tests	5m 0s
Native Tests - Data1	18m 32s
Native Tests - Data2	29m 27s
Native Tests - Virtual Thread - ${{ matrix.category }}	0s
Native Tests - Data3	14m 27s
Native Tests - Data5	9m 13s
Native Tests - Data7	11m 20s
Native Tests - Misc1	9m 1s
Native Tests - Misc2	8m 20s
Native Tests - Misc3	15m 1s
Native Tests - Misc4	19m 36s
Native Tests - Spring	9m 18s
Native Tests - gRPC	2m 10s
Native Tests - Windows support	7m 17s
Upload build stats to collector	0s
Build report	56s
	13h 57m 14s

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