Merge Gradle/Maven starter projects to reduce duplication

Author: marcphilipp

platform-tooling-support-tests/projects/gradle-starter/build.gradle.kts renamed to platform-tooling-support-tests/projects/jupiter-starter/build.gradle.kts

@@ -63,24 +63,6 @@
                     </properties>
                 </configuration>
             </plugin>
-            <plugin>
-                <groupId>org.codehaus.gmaven</groupId>
-                <artifactId>groovy-maven-plugin</artifactId>
-                <version>2.1.1</version>
-                <executions>
-                    <execution>
-                        <phase>validate</phase>
-                        <goals>
-                            <goal>execute</goal>
-                        </goals>
-                        <configuration>
-                            <source>
-                                println("Using Java version: ${java.version}")
-                            </source>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
         </plugins>
     </build>
 

platform-tooling-support-tests/projects/gradle-starter/gradle.properties renamed to platform-tooling-support-tests/projects/jupiter-starter/gradle.properties

@@ -35,7 +35,7 @@ class GradleStarterTests {
 	@Test
 	void gradle_wrapper(@TempDir Path workspace, @FilePrefix("gradle") OutputFiles outputFiles) throws Exception {
 		var result = ProcessStarters.gradlew() //
-				.workingDir(copyToWorkspace(Projects.GRADLE_STARTER, workspace)) //
+				.workingDir(copyToWorkspace(Projects.JUPITER_STARTER, workspace)) //
 				.addArguments("-Dmaven.repo=" + MavenRepo.dir()) //
 				.addArguments("build", "--no-daemon", "--stacktrace", "--no-build-cache", "--warning-mode=fail") //
 				.putEnvironment("JDK8", Helper.getJavaHome("8").orElseThrow(TestAbortedException::new).toString()) //

platform-tooling-support-tests/projects/maven-starter/pom.xml renamed to platform-tooling-support-tests/projects/jupiter-starter/pom.xml

@@ -39,10 +39,10 @@ class MavenStarterTests {
 	MavenRepoProxy mavenRepoProxy;
 
 	@Test
-	void verifyMavenStarterProject(@TempDir Path workspace, @FilePrefix("maven") OutputFiles outputFiles)
+	void verifyJupiterStarterProject(@TempDir Path workspace, @FilePrefix("maven") OutputFiles outputFiles)
 			throws Exception {
 		var result = ProcessStarters.maven(Helper.getJavaHome("8").orElseThrow(TestAbortedException::new)) //
-				.workingDir(copyToWorkspace(Projects.MAVEN_STARTER, workspace)) //
+				.workingDir(copyToWorkspace(Projects.JUPITER_STARTER, workspace)) //
 				.addArguments(localMavenRepo.toCliArgument(), "-Dmaven.repo=" + MavenRepo.dir()) //
 				.addArguments("-Dsnapshot.repo.url=" + mavenRepoProxy.getBaseUri()) //
 				.addArguments("--update-snapshots", "--batch-mode", "verify") //