[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/j+k/invisiblePackagePrivateInheritedMember.fir.kt

@@ -19,5 +19,5 @@ package c
 import b.F
 
 fun f() {
-    F().<!INAPPLICABLE_CANDIDATE!>m<!>
+    F().<!HIDDEN!>m<!>
 }