[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/scopes/protectedVisibility/protectedCallOnSubClass.fir.kt

@@ -4,7 +4,7 @@ open class A {
 
     fun bar(x: B) {
         x.foo() // OK, foo declared in A
-        x.<!INAPPLICABLE_CANDIDATE!>baz<!>() // Declared in B
+        x.<!HIDDEN!>baz<!>() // Declared in B
         x.foobaz() // Declared in B
     }
 }