[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/fir/analysis-tests/testData/resolveWithStdlib/callableReferences/companions.kt

@@ -34,13 +34,13 @@ fun main() {
     <!AMBIGUITY!>foo3<!>(KotlinClass::baz)
 
     // Type mismatch
-    <!INAPPLICABLE_CANDIDATE!>foo1<!>(KotlinClass::bar)
+    <!INAPPLICABLE_CANDIDATE!>foo1<!>(<!UNRESOLVED_REFERENCE!>KotlinClass::bar<!>)
     foo2(KotlinClass::bar)
     foo3(KotlinClass::bar)
 
     foo1(KotlinClass2::bar)
     // Type mismatch
-    <!INAPPLICABLE_CANDIDATE!>foo2<!>(KotlinClass2::bar)
+    <!INAPPLICABLE_CANDIDATE!>foo2<!>(<!UNRESOLVED_REFERENCE!>KotlinClass2::bar<!>)
     foo3(KotlinClass2::bar)
 }