Update how we handle autocomplete and format for zero-arity functions in ExpressionEditor (#26563)

* Update suggestionText function

* Suggest with closing parens if zero-arity

* Format zero-arity functions with ()

frontend/src/metabase-lib/expressions/format.js

@@ -112,7 +112,7 @@ function formatFunction([fn, ...args], options) {
   const formattedName = getExpressionName(fn);
   const formattedArgs = args.map(arg => format(arg, options));
   return args.length === 0
-    ? formattedName
+    ? formattedName + "()"
     : `${formattedName}(${formattedArgs.join(", ")})`;
 }
 

frontend/src/metabase-lib/expressions/suggest.js

@@ -16,11 +16,7 @@ import {
   formatSegmentName,
 } from "./index";
 
-const suggestionText = func => {
-  const { displayName, args } = func;
-  const suffix = args.length > 0 ? "(" : " ";
-  return displayName + suffix;
-};
+const suggestionText = func => func.displayName + "(";
 
 export function suggest({
   source,