Fix gradle IT with scripting discovery

The test is not designed to fail if the definitions are not discovered -
the script files have completely custom extensions and therefore ignored.
So checking for the warning in the build log is enough.
#KT-32697 fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SubpluginsIT.kt

@@ -160,7 +160,6 @@ class SubpluginsIT : BaseGradleIT() {
                     assertCompiledKotlinSources(project.relativize(bobGreet, aliceGreet, worldGreet, greetScriptTemplateKt))
                 }
             } else {
-                assertFailed()
                 val usedGradleVersion =
                     GradleVersion.version(
                         System.getProperty("kotlin.gradle.version.for.tests")