[FIR] Improve diagnostic reporting & don't use error symbol for candidate if possible

Also introduce few new diagnostics:
- NONE_APPLICABLE more many inapplicable candidates
- HIDDEN for visible candidates

compiler/testData/diagnostics/tests/PackageInExpressionPosition.fir.kt

@@ -19,8 +19,8 @@ fun main() {
     java.lang.System = null
     java.lang.System!!
     System is Int
-    <!INAPPLICABLE_CANDIDATE!>System<!>()
+    <!HIDDEN!>System<!>()
     (System)
     foo@ System
     null <!UNRESOLVED_REFERENCE!>in<!> System
-}
+}