FIR checker: introduce NO_(GET|SET)_METHOD

Besides introducing new diagnostics, this commit unifies source usages
for array accesses in PSI & LT.

compiler/testData/diagnostics/tests/incompleteCode/diagnosticWithSyntaxError/arrayExpression.fir.kt

@@ -4,5 +4,5 @@ package bar
 fun main() {
     class Some
 
-    Some[<!SYNTAX!><!>] <!UNRESOLVED_REFERENCE!>names<!> <!UNRESOLVED_REFERENCE!><!SYNTAX!>=<!> ["ads"]<!>
+    Some[<!SYNTAX!><!>] <!UNRESOLVED_REFERENCE!>names<!> <!SYNTAX!>=<!> <!NO_GET_METHOD!>["ads"]<!>
 }