KT-7443 Inspection + intention to replace assert (x != null) with "!!" or elvis

#KT-7443 Fixed

idea/testData/intentions/simplifyAssertNotNull/noMessage.kt

@@ -0,0 +1,7 @@
+// INTENTION_TEXT: "Replace with '!!' operator"
+// WITH_RUNTIME
+
+fun foo(p: Array<String?>) {
+    val v = p[0]
+    <caret>assert(v != null)
+}