[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/testsWithStdLib/inference/kt1558.fir.kt

@@ -20,7 +20,7 @@ fun testArrays(ci: List<Int?>, cii: List<Int?>?) {
 
     checkSubtype<Array<Int?>>(c1)
     checkSubtype<Array<Int?>>(c2)
-    <!INAPPLICABLE_CANDIDATE!>checkSubtype<!><Array<Int?>>(c3)
+    checkSubtype<Array<Int?>>(c3)
     checkSubtype<Array<Int?>>(c4)
-    <!INAPPLICABLE_CANDIDATE!>checkSubtype<!><Array<Int?>>(c5)
+    checkSubtype<Array<Int?>>(c5)
 }