[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/operatorRem/noDeprecatedModConventionWithoutFeature.fir.kt

@@ -25,14 +25,14 @@ operator fun ModMemberAndRemExtension.rem(x: Int) {}
 
 fun foo() {
     ModAndRem % 1
-    OldMod <!INAPPLICABLE_CANDIDATE!>%<!> 1
+    OldMod <!NONE_APPLICABLE!>%<!> 1
 
     ModAndRemExtension % 1
 
-    ModExtension <!INAPPLICABLE_CANDIDATE!>%<!> 1
+    ModExtension <!NONE_APPLICABLE!>%<!> 1
 
     ModMemberAndRemExtension % 1
 
     OldMod.mod(1)
     ModExtension.mod(1)
-}
+}