Use CertificateGenerator in OIDC Wiremock tests #2181

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JVM Tests - JDK 17	3m 47s
JVM Tests - JDK 21	5m 41s
JVM Tests - JDK 17 Windows	5m 49s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Gradle Tests - JDK ${{ matrix.java.name }}	0s
Maven Tests - JDK ${{ matrix.java.name }}	0s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
Native Tests - Security2	5m 49s
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MicroProfile TCKs Tests	0s
Native Tests - Virtual Thread - ${{ matrix.category }}	0s
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Build report	29s
	38m 26s

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