[3.20] Remove empty VertxUtilTest.java that was erroneously added in a backport

[AntStephenson]

Remove VertxUtilTest.java that was erroneously added as an empty file in a backport and not required on the 3.20 branch.

Fixes: https://issues.redhat.com/browse/QUARKUS-6939

[quarkus-bot]

/cc @aloubyansky (3.20), @gastaldi (3.20), @gsmet (3.20), @jmartisk (3.20), @rsvoboda (3.20)

[quarkus-bot]

/cc @brunobat (opentelemetry), @radcortez (opentelemetry)

[AntStephenson]

FYI @jponge (I have no permissions to add you as a reviewer)

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 42c63c2.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.

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Flaky tests - Develocity

⚙️ MicroProfile TCKs Tests

📦 tcks/microprofile-lra

❌ org.eclipse.microprofile.lra.tck.TckRecoveryTests.testCancelWhenParticipantIsUnavailable - History

• Expecting the metric Compensated callback was called Expected: a value equal to or greater than <1> but: <0> was less than <1> - java.lang.AssertionError

java.lang.AssertionError: 
Expecting the metric Compensated callback was called
Expected: a value equal to or greater than <1>
     but: <0> was less than <1>
	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
	at org.eclipse.microprofile.lra.tck.TckRecoveryTests.assertMetricCallbackCalled(TckRecoveryTests.java:210)
	at org.eclipse.microprofile.lra.tck.TckRecoveryTests.testCancelWhenParticipantIsUnavailable(TckRecoveryTests.java:195)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)