[K/N][Tests] Migrate driver test llvm_variant_dev

^KT-61259

kotlin-native/backend.native/tests/build.gradle

@@ -1730,22 +1730,6 @@ tasks.register("override_konan_properties0", KonanDriverTest) {
     }
 }
 
-tasks.register("llvm_variant_dev", KonanDriverTest) {
-    // We use clang from Xcode on macOS for apple targets,
-    // so it is hard to reliably detect LLVM variant for these targets.
-    disabled = PlatformInfo.isAppleTarget(project)
-        || isAggressiveGC // No need to test with different GC schedulers
-    flags = [
-            "-Xllvm-variant=dev",
-            "-Xverbose-phases=ObjectFiles"
-    ]
-    compilerMessages = true
-    source = "link/ir_providers/hello.kt"
-    // User LLVM variant has "essentials" suffix.
-    def message = "-essentials"
-    outputChecker = { out -> !out.contains(message) }
-}
-
 /**
  * Builds tests into a single binary with TestRunner
  */