[Test] Add debug names to unnamed test disposables

- This helps to track down disposables which are never disposed, and
  reduces confusion when printing disposables in general (the names will
  now be meaningful, instead of endless lists of "newDisposable" and
  "TestDisposable").

^KT-64099

libraries/tools/ide-plugin-dependencies-validator/src/org/jetbrains/kotlin/ide/plugin/dependencies/validator/ExperimentalOptInUsageInSourceChecker.kt

@@ -83,7 +83,7 @@ object ExperimentalOptInUsageInSourceChecker {
 
     private fun createProjectForParsing(): Project {
         return KotlinCoreEnvironment.createForProduction(
-            Disposer.newDisposable(),
+            Disposer.newDisposable("Disposable for project of ${ExperimentalOptInUsageInSourceChecker::class.simpleName}"),
             CompilerConfiguration(),
             EnvironmentConfigFiles.JVM_CONFIG_FILES
         ).project