Add test for EnumConverter #36421

Job	Run time
Attach pull request number	2s
CI Sanity Check	32s
Initial JDK 17 Build	9m 30s
Calculate Test Jobs	9s
JVM Tests - JDK 17	1m 44s
JVM Tests - JDK 21	2m 35s
Quickstarts Compilation - JDK 17	5m 27s
JVM Tests - JDK 17 Windows	4m 49s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Gradle Tests - JDK ${{ matrix.java.name }}	0s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
MicroProfile TCKs Tests	0s
Maven Tests - JDK ${{ matrix.java.name }}	0s
Native Tests - Virtual Thread - ${{ matrix.category }}	0s
Native Tests - ${{ matrix.category }}	0s
Build report	20s
	25m 8s

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