[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/kt1806.fir.kt

@@ -8,7 +8,7 @@ object MyObject {
 
 fun test1() {
 
-    doSmth(MyObject.<!INAPPLICABLE_CANDIDATE!>message<!>)
+    doSmth(MyObject.<!HIDDEN!>message<!>)
 }
 
 class Test {
@@ -17,8 +17,8 @@ class Test {
   }
 
   fun test2() {
-      doSmth(MyObject1.<!INAPPLICABLE_CANDIDATE!>message<!>)
+      doSmth(MyObject1.<!HIDDEN!>message<!>)
   }
 }
 
-fun doSmth(s: String) = s
+fun doSmth(s: String) = s