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/kt4866UnresolvedArrayAccess.fir.kt

@@ -1,5 +1,5 @@
 //KT-4866 Resolve does not work inside brackets with unresolved reference before
 
 fun test(i: Int, j: Int) {
-    <!UNRESOLVED_REFERENCE!><!UNRESOLVED_REFERENCE!>foo<!>[i, j]<!>
-}
+    <!UNRESOLVED_REFERENCE!>foo<!><!NO_GET_METHOD!>[i, j]<!>
+}