test(language-service): recognize inputs/ouputs declared in decorator (#34875)

This commit adds a regression test to check that the language service
recognizes inputs and outputs declared in a directive decorator.

See #34874.

PR Close #34875

packages/language-service/test/project/app/main.ts

@@ -34,6 +34,7 @@ import * as ParsingCases from './parsing-cases';
     ParsingCases.CaseMissingClosing,
     ParsingCases.CaseUnknown,
     ParsingCases.EmptyInterpolation,
+    ParsingCases.HintModel,
     ParsingCases.NoValueAttribute,
     ParsingCases.NumberModel,
     ParsingCases.Pipes,