[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/callResolution/errorCandidates.txt

@@ -12,7 +12,7 @@ FILE: errorCandidates.kt
     public final fun bar(x: R|B|): R|kotlin/Unit| {
     }
     public final fun test(c: R|C|): R|kotlin/Unit| {
-        <Inapplicable(INAPPLICABLE): [/foo]>#(String())
+        <Inapplicable(INAPPLICABLE): /foo>#(String())
         <Ambiguity: bar, [/bar, /bar]>#(R|<local>/c|)
         <Unresolved name: baz>#()
     }