Fix handling multipart requests manually

[stuartwdouglas]

Fixes #19404

[quarkus-bot]

Failing Jobs - Building aafbbf5

Status	Name	Step	Test failures	Logs	Raw logs
✖	JVM Tests - JDK 11	Build	Test failures	Logs	Raw logs
✖	JVM Tests - JDK 16	Build	Test failures	Logs	Raw logs

Full information is available in the Build summary check run.

Test Failures

⚙️ JVM Tests - JDK 11 #

📦 extensions/scheduler/deployment

✖ io.quarkus.scheduler.test.metrics.MicrometerTimedTest.testTimedMethod line 63 - More details - Source on GitHub

org.opentest4j.AssertionFailedError: Count=0 ==> expected: <true> but was: <false>
	at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:55)
	at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:40)
	at org.junit.jupiter.api.Assertions.assertTrue(Assertions.java:193)
	at io.quarkus.scheduler.test.metrics.MicrometerTimedTest.testTimedMethod(MicrometerTimedTest.java:63)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at io.quarkus.test.QuarkusUnitTest.runExtensionMethod(QuarkusUnitTest.java:363)
	at io.quarkus.test.QuarkusUnitTest.interceptTestMethod(QuarkusUnitTest.java:331)
	at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.la...

---

⚙️ JVM Tests - JDK 16 #

📦 extensions/smallrye-reactive-messaging-kafka/deployment

✖ io.quarkus.smallrye.reactivemessaging.kafka.deployment.testing.KafkaDevServicesContinuousTestingTestCase.testContinuousTestingScenario1 line 64 - More details - Source on GitHub

org.opentest4j.AssertionFailedError: expected: <1> but was: <0>
	at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:55)
	at org.junit.jupiter.api.AssertionUtils.failNotEqual(AssertionUtils.java:62)
	at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:166)
	at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:161)
	at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:611)
	at io.quarkus.smallrye.reactivemessaging.kafka.deployment.testing.KafkaDevServicesContinuousTestingTestCase.testContinuousTestingScenario1(KafkaDevServicesContinuousTestingTestCase.java:64)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:567)
	at org.junit.pla...

[stuartwdouglas]

Failures are unrelated and I have submitted other PR's to fix them.