refactor: remove unused skipTestForProposalBudget function

Author: kneerose

tests/govtool-frontend/playwright/lib/helpers/cardano.ts

@@ -65,8 +65,3 @@ export async function skipIfMainnet() {
     test.skip();
   }
 }
-
-export async function skipTestForProposalBudget() {
-  await allure.description("Proposal budget features are not yet available.");
-  test.skip();
-}

tests/govtool-frontend/playwright/lib/pages/budgetDiscussionDetailsPage.ts

@@ -1,8 +1,5 @@
 import { expect, Page } from "@playwright/test";
-import {
-  BudgetProposalProps,
-  CommentResponse,
-} from "@types";
+import { BudgetProposalProps, CommentResponse } from "@types";
 import environments from "lib/constants/environments";
 
 export default class BudgetDiscussionDetailsPage {