Use CertificateGenerator in OIDC Wiremock tests #47540

Job	Run time
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CI Sanity Check	31s
Initial JDK 17 Build	11m 43s
Calculate Test Jobs	9s
JVM Tests - JDK 17	4m 52s
JVM Tests - JDK 21	5m 27s
Gradle Tests - JDK ${{ matrix.java.name }}	0s
JVM Tests - JDK 17 Windows	5m 54s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
Maven Tests - JDK ${{ matrix.java.name }}	0s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Native Tests - Security2	5m 56s
Quickstarts Compilation - JDK ${{ matrix.java.name }}	0s
MicroProfile TCKs Tests	0s
Native Tests - Virtual Thread - ${{ matrix.category }}	0s
Build report	32s
Upload build stats to collector	0s
	35m 12s

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