[Test] Sort failed exceptions in JUnit5Assertions.assertAll

This is needed to throw FileComparisonFailure first, because idea
  test UI can not show multiple diff windows for multiple assertions
  and shows only first, which is not useful

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/services/JUnit5Assertions.kt

@@ -54,7 +54,7 @@ object JUnit5Assertions : AssertionsService() {
 
     override fun assertAll(exceptions: List<Throwable>) {
         exceptions.singleOrNull()?.let { throw it }
-        JUnit5PlatformAssertions.assertAll(exceptions.map { Executable { throw it } })
+        JUnit5PlatformAssertions.assertAll(exceptions.sortedWith(FileComparisonFailureFirst).map { Executable { throw it } })
     }
 
     override fun assertNotNull(value: Any?, message: (() -> String)?) {
@@ -68,4 +68,10 @@ object JUnit5Assertions : AssertionsService() {
     override fun fail(message: () -> String): Nothing {
         org.junit.jupiter.api.fail(message)
     }
+
+    private object FileComparisonFailureFirst : Comparator<Throwable> {
+        override fun compare(o1: Throwable?, o2: Throwable?): Int {
+            return if (o1 is FileComparisonFailure) -1 else 0
+        }
+    }
 }