squash! Run StandaloneTests for Java 8 under Java 8

Because option `-showversion` of Java 8 behaves slightly differently to
option `--show-version` of later versions of Java, prepare two new
files for expected stdout and stderr -- expected-out-java8.txt and
expected-err-java8.txt -- which are similar to existing files
expected-out.txt and expected-err.txt, but have different layout of
fastforward lines "JAVA VERSION" and "TREE".

platform-tooling-support-tests/projects/standalone/expected-err-java8.txt

@@ -0,0 +1,21 @@
+>> JAVA VERSION >>
+.+ org.junit.platform.launcher.core.ServiceLoaderRegistry load
+.+ Loaded LauncherInterceptor instances: ..
+.+ org.junit.platform.launcher.core.ServiceLoaderRegistry load
+.+ Loaded LauncherSessionListener instances: ..
+.+ org.junit.platform.launcher.core.ServiceLoaderTestEngineRegistry loadTestEngines
+.+ Discovered TestEngines:
+- junit-jupiter .+
+- junit-vintage .+
+- junit-platform-suite .+
+.+ org.junit.platform.launcher.core.ServiceLoaderRegistry load
+.+ Loaded PostDiscoveryFilter instances: ..
+.+ org.junit.platform.launcher.core.ServiceLoaderRegistry load
+.+ Loaded LauncherDiscoveryListener instances: ..
+.+ org.junit.platform.launcher.core.ServiceLoaderRegistry load
+.+ Loaded TestExecutionListener instances: .+
+.+ org.junit.platform.launcher.core.ServiceLoaderTestEngineRegistry loadTestEngines
+.+ Discovered TestEngines:
+- junit-jupiter .+
+- junit-vintage .+
+- junit-platform-suite .+

platform-tooling-support-tests/projects/standalone/expected-out-java8.txt

@@ -0,0 +1,18 @@
+>> TREE >>
+Failures (2):
+>> STACKTRACE >>
+
+Test run finished after \d+ ms
+[        11 containers found      ]
+[         0 containers skipped    ]
+[        11 containers started    ]
+[         0 containers aborted    ]
+[        11 containers successful ]
+[         0 containers failed     ]
+[        10 tests found           ]
+[         2 tests skipped         ]
+[         8 tests started         ]
+[         1 tests aborted         ]
+[         5 tests successful      ]
+[         2 tests failed          ]
+

platform-tooling-support-tests/src/test/java/platform/tooling/support/tests/StandaloneTests.java

@@ -390,8 +390,8 @@ void executeOnJava8() throws IOException {
 		assertEquals(1, result.getExitCode(), () -> getExitCodeMessage(result));
 
 		var workspace = Request.WORKSPACE.resolve("standalone");
-		var expectedOutLines = Files.readAllLines(workspace.resolve("expected-out.txt"));
-		var expectedErrLines = Files.readAllLines(workspace.resolve("expected-err.txt"));
+		var expectedOutLines = Files.readAllLines(workspace.resolve("expected-out-java8.txt"));
+		var expectedErrLines = Files.readAllLines(workspace.resolve("expected-err-java8.txt"));
 		assertLinesMatch(expectedOutLines, result.getOutputLines("out"));
 		assertLinesMatch(expectedErrLines, result.getOutputLines("err"));
 
@@ -427,8 +427,8 @@ void executeOnJava8SelectPackage() throws IOException {
 		assertEquals(1, result.getExitCode(), () -> getExitCodeMessage(result));
 
 		var workspace = Request.WORKSPACE.resolve("standalone");
-		var expectedOutLines = Files.readAllLines(workspace.resolve("expected-out.txt"));
-		var expectedErrLines = Files.readAllLines(workspace.resolve("expected-err.txt"));
+		var expectedOutLines = Files.readAllLines(workspace.resolve("expected-out-java8.txt"));
+		var expectedErrLines = Files.readAllLines(workspace.resolve("expected-err-java8.txt"));
 		assertLinesMatch(expectedOutLines, result.getOutputLines("out"));
 		assertLinesMatch(expectedErrLines, result.getOutputLines("err"));