KT-16264 Forbid usage of _ without backticks

Forbid underscore-only (_, __, ___, ...) names as callees and as types.

If CHECK_TYPE directive is on, filter out UNDERSCORE_USAGE_WITHOUT_BACKTICKS messages.

compiler/testData/diagnostics/tests/declarationChecks/destructuringDeclarations/underscore.kt

@@ -38,11 +38,11 @@ fun test() {
 
     val (<!REDECLARATION!>`_`<!>, z) = A()
 
-    foo(_, z)
+    foo(<!UNDERSCORE_USAGE_WITHOUT_BACKTICKS!>_<!>, z)
 
     val (_, <!NAME_SHADOWING, REDECLARATION!>`_`<!>) = A()
 
-    foo(<!TYPE_MISMATCH!>_<!>, y)
+    foo(<!UNDERSCORE_USAGE_WITHOUT_BACKTICKS, TYPE_MISMATCH!>_<!>, y)
 
     val (<!UNUSED_VARIABLE!>unused<!>, _) = A()
 }