[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/resolve/expresssions/access.kt

@@ -21,7 +21,7 @@ class Bar {
     }
 
     // NB! abc() here is resolved to member Foo.abc(), and not to extension member of Bar
-    fun Foo.check() = abc() <!INAPPLICABLE_CANDIDATE!>+<!> bar()
+    fun Foo.check() = abc() <!NONE_APPLICABLE!>+<!> bar()
 
     // NB! + here is resolved to member String.plus (not to extension member above)
     fun Foo.check2() = "" + bar()
@@ -60,4 +60,4 @@ fun f() {
     <!UNRESOLVED_REFERENCE!>dcb<!>()
 
     abc()
-}
+}