Reapply "[ Device Lab ] Upgrade Device Lab projects to Java 18" (#166016) (#166059)

This reverts commit
8dccbc33df.

Find/replace didn't catch the use of `jvmTarget = "1.8"` in
`dev/integration_tests/android_engine_test/android/app/build.gradle` and
`android_engine_test` needed to have `"com.android.application"`
updated.

dev/devicelab/lib/tasks/run_tests.dart

@@ -105,12 +105,6 @@ class AndroidRunOutputTest extends RunOutputTask {
     }
   }
 
-  @override
-  bool isExpectedStderr(String line) {
-    // TODO(egarciad): Remove once https://github.com/flutter/flutter/issues/95131 is fixed.
-    return line.contains('Mapping new ns');
-  }
-
   @override
   TaskResult verify(List<String> stdout, List<String> stderr) {
     final String gradleTask = release ? 'assembleRelease' : 'assembleDebug';