[kotlin.test] Don't run filtered out test suites by default

Popular frameworks such as JUnit, TestNG and Google Test do not
run test suites whose tests were fully filtered out. Thus
@BeforeClass/@AfterClass of such suites are not executed and the
suites are not reported in a test report.

This patch introduces the same behaviour to the Kotlin/Native's
kotlin.test runner.

See also: #4522, #4615.

kotlin-native/backend.native/tests/testing/filtered_suites.kt

@@ -0,0 +1,57 @@
+package kotlin.test.tests
+
+import kotlin.test.*
+
+private fun hook(message: String) {
+    print("Hook: ")
+    println(message)
+}
+
+class A {
+    @Test
+    fun foo() {}
+
+    @Test
+    fun common() {}
+
+    @Ignore
+    @Test
+    fun ignored() {}
+
+    companion object {
+        @BeforeClass
+        fun before() = hook("A.before")
+
+        @AfterClass
+        fun after() = hook("A.after")
+    }
+}
+
+@Ignore
+class Ignored {
+    @Test
+    fun bar() {}
+
+    @Test
+    fun common() {}
+
+    companion object {
+        @BeforeClass
+        fun before() = hook("Ignored.before")
+
+        @AfterClass
+        fun after() = hook("Ignored.after")
+    }
+}
+
+@BeforeClass
+fun before() = hook("Filtered_suitesKt.before")
+
+@AfterClass
+fun after() = hook("Filtered_suitesKt.after")
+
+@Test
+fun baz() {}
+
+@Test
+fun common() {}