feat(language-service): completions for output $event properties in (#34570)

This commit adds support for completions of properties on `$event`
variables in bound outputs.

This is the second major PR to support completions for `$event`
variables (https://github.com/angular/vscode-ng-language-service/issues/531).
The final completion support that must be provided is for `$event`
variables in bindings targeting DOM events, like `(click)`.

PR Close #34570

packages/language-service/src/locate_symbol.ts

@@ -109,7 +109,7 @@ function locateSymbol(ast: TemplateAst, path: TemplateAstPath, info: AstResult):
         visitVariable(ast) {},
         visitEvent(ast) {
           if (!attributeValueSymbol()) {
-            symbol = findOutputBinding(info, path, ast);
+            symbol = findOutputBinding(ast, path, info.template.query);
             symbol = symbol && new OverrideKindSymbol(symbol, DirectiveKind.EVENT);
             span = spanOf(ast);
           }