[K/N][tests] Support tag expressions for :native:native.tests:test

This commits adds a Gradle project property 'kotlin.native.tests.tags',
which can be used when running :native:native.tests:test task to filter
tests by tags. The property value can contain an arbitrary JUnit tag
expression. See
https://junit.org/junit5/docs/current/user-guide/#running-tests-tag-expressions
for more details.

native/native.tests/build.gradle.kts

@@ -55,7 +55,10 @@ val cachesTest = nativeTest("cachesTest", "caches")
 val k1libContentsTest = nativeTest("k1libContentsTest", "k1libContents")
 val k2libContentsTest = nativeTest("k2libContentsTest", "k2libContents")
 
-val test by nativeTest("test", null /* no tags */)
+val testTags = findProperty("kotlin.native.tests.tags")?.toString()
+// Note: arbitrary JUnit tag expressions can be used in this property.
+// See https://junit.org/junit5/docs/current/user-guide/#running-tests-tag-expressions
+val test by nativeTest("test", testTags)
 
 val generateTests by generator("org.jetbrains.kotlin.generators.tests.GenerateNativeTestsKt") {
     javaLauncher.set(project.getToolchainLauncherFor(JdkMajorVersion.JDK_11_0))