update sample tests, fix Java tests (#20300)

* replace removed forkMode

* remove junit runner where it's not needed

* update samples without skipping test files, but skip files named "FILES"

* revert overwriting custom tests, add custom java tests to list

* add one sample to CircleCI, fix various Java tests

samples/client/petstore/java/resttemplate-withXml/pom.xml

@@ -66,7 +66,7 @@
                     </systemPropertyVariables>
                     <argLine>-Xms512m -Xmx1500m</argLine>
                     <parallel>methods</parallel>
-                    <forkMode>pertest</forkMode>
+                    <reuseForks>false</reuseForks>
                     <useUnlimitedThreads>true</useUnlimitedThreads>
                 </configuration>
                 <dependencies>
@@ -283,12 +283,6 @@
             <version>${junit-version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.junit.platform</groupId>
-            <artifactId>junit-platform-runner</artifactId>
-            <version>${junit-platform-runner.version}</version>
-            <scope>test</scope>
-        </dependency>
     </dependencies>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -299,6 +293,5 @@
         <jakarta-annotation-version>1.3.5</jakarta-annotation-version>
         <beanvalidation-version>2.0.2</beanvalidation-version>
         <junit-version>5.10.2</junit-version>
-        <junit-platform-runner.version>1.10.0</junit-platform-runner.version>
     </properties>
 </project>