[K/N] XCTest support: Make compiler produce bundles

XCTest test binary is a bundle plug-in that is similar to a framework.
This is a part of ^KT-58928

Merge-request: KT-MR-10662
Merged-by: Pavel Punegov <Pavel.Punegov@jetbrains.com>

native/utils/src/org/jetbrains/kotlin/konan/target/CompilerOutputKind.kt

@@ -26,6 +26,9 @@ enum class CompilerOutputKind {
     BITCODE {
         override fun suffix(target: KonanTarget?) = ".bc"
     },
+    TEST_BUNDLE {
+        override fun suffix(target: KonanTarget?): String = ".xctest"
+    },
 
     DYNAMIC_CACHE {
         override fun suffix(target: KonanTarget?) = ".${target!!.family.dynamicSuffix}"