Update removeExtension gradle tests to fix CI

[glefloch]

The snapshot ci job and the release test job are both failing due to failed gradle tests.

All failed tests are happening on ./gradlew removeExtension --extensions="hibernate-orm".

From what I saw, the remove extension command fails with the following exception:

  Could not resolve all files for configuration ':runtimeClasspath'.
      > Could not find javax.persistence-api-2.2.jar (javax.persistence:javax.persistence-api:2.2).
         Searched in the following locations:
             file:/Users/glefloch/.m2.tmp/repo/javax/persistence/javax.persistence-api/2.2/javax.persistence-api-2.2.jar

this dependency is a transitive dependency of the hibernate-orm extension previously added in the test. This exception is thrown at

at io.quarkus.gradle.builder.QuarkusModelBuilder.collectDependencies(QuarkusModelBuilder.java:329)

When looking in my maven repo, the jar is missing, the pom is present and there is a _remote.repositories with the following content:

#NOTE: This is a Maven Resolver internal implementation file, its format can be changed without prior notice. 
#Tue Nov 10 14:42:04 CET 2020
javax.persistence-api-2.2.pom>central=

Removing this file fix tests.

In order to avoid failures, I updated tests to use the openshift extension instead of the hibernate-orm extension.
The Release test job is green on my fork.

If you have some explanation about that, I would be happy to understand :) and if you have any other alternative, that would be great!

[aloubyansky]

Caused by: org.apache.maven.plugin.MojoFailureException: File '/home/runner/work/quarkus/quarkus/integration-tests/gradle/src/test/java/io/quarkus/gradle/AddExtensionToSingleModuleKtsProjectTest.java' has not been previously formatted.  Please format file and commit before running validation!

[glefloch]

I updated the code, should be good now. Sorry for that.