Ensure that rest-client and rest-client-reactive are not used together

[geoand]

This has come up multiple times, with the latest being #18792

This should not be allowed, but I am not sure if there are any tricky situations that could cause this to fail.

cc @michalszynkiewicz @gsmet @sberyozkin @stuartwdouglas

[quarkus-bot]

Failing Jobs - Building 74580b2

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

Full information is available in the Build summary check run.

Test Failures

⚙️ JVM Tests - JDK 11 Windows #

📦 extensions/panache/mongodb-panache/deployment

✖ io.quarkus.mongodb.panache.mongoentity.MongoEntityTest. - More details - Source on GitHub

java.lang.RuntimeException: 
java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
	[error]: Build step io.quarkus.mongodb.deployment.DevServicesMongoProcessor#startMongo threw an exception: java.lang.IllegalStateException: Could not find a valid Docker environment. Please see logs and check configuration
	at org.testcontainers.dockerclient.DockerClientProviderStrategy.lambda$getFirstValidStrategy$7(DockerClientProviderStrategy.java:215)
	at java.base/java.util.Optional.orElseThrow(Optional.java:408)
	at org.testcontainers.dockerclient.DockerClientProviderStrategy.getFirstValidStrategy(DockerClientProviderStrategy.java:207)
	at org.testcontainers.DockerClientFactory.getOrInitializeStrategy(DockerClientFactory.java:136)
	at org.testcontainers.DockerClientFactory.client(DockerClientFactory.java:178)
	at org.testcontainers.LazyDockerClient.getDockerClient(LazyDockerClient.java:14)
	at org.testcontainers.LazyDockerClient.authConfig(LazyDockerClient.java:12)
	at org.testcontainers.containers.GenericContainer.start(GenericContainer.java:310)
	at io.quarkus.mongodb.deployment.DevServicesMongoProcessor.startMongo(DevServicesMongoProcessor.java:175)
	at io.quarkus.mongodb.deployment.DevServicesMongoProcessor.startMongo(DevServicesMongoProcessor.java:95)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:6...

[geoand]

@sberyozkin can you also verify this?