[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/inference/cannotCompleteResolveNoneApplicable.fir.kt

@@ -4,5 +4,5 @@ fun <T> f(i: Int, t: T, c: MutableCollection<T>) {}
 fun <T> f(a: Any, t: T, l: MutableList<T>) {}
 
 fun test(l: List<Int>) {
-    <!INAPPLICABLE_CANDIDATE!>f<!>(1, "", l)
+    <!NONE_APPLICABLE!>f<!>(1, "", l)
 }