K2 Scripting: enable K2 tests in some test projects

libraries/scripting/jvm-host-test/build.gradle.kts

@@ -59,3 +59,9 @@ projectTest(taskName = "testWithIr", parallel = true) {
     workingDir = rootDir
     systemProperty("kotlin.script.base.compiler.arguments", "-Xuse-ir")
 }
+
+projectTest(taskName = "testWithK2", parallel = true) {
+    dependsOn(":dist")
+    workingDir = rootDir
+    systemProperty("kotlin.script.base.compiler.arguments", "-Xuse-k2")
+}

libraries/scripting/jvm-host-test/test/kotlin/script/experimental/jvmhost/test/ScriptingHostTest.kt

@@ -255,7 +255,7 @@ class ScriptingHostTest : TestCase() {
             }
             assertTrue(comp0 is ResultWithDiagnostics.Failure)
             val errors = comp0.reports.filter { it.severity == ScriptDiagnostic.Severity.ERROR }
-            assertTrue( errors.any { it.message == "Only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type String?" })
+            assertTrue( errors.any { it.message.contains( "Only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type ") })
 
             // runtime
             fun evalWith(evalConfig: ScriptEvaluationConfiguration) =