Fixed signup-form-tests GitHub workflow

refs https://ghost.slack.com/archives/C02G9E68C/p1685446707169999

- `actions/setup-node` has a bug where it doesn't parse paths where the path is pretty-printed with colors, so we have to explicitly disable colors
- Added whitespace change inside signup-form to trigger new CI run

.github/workflows/signup-form-tests.yml

@@ -24,6 +24,8 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
+        env:
+          FORCE_COLOR: 0
         with:
           node-version: "16.13.0"
           cache: yarn

ghost/signup-form/test/utils/e2e.ts

@@ -26,6 +26,7 @@ export async function initialize({page, ...options}: {page: any; title?: string,
         }
         document.body.appendChild(scriptTag);
     }, {url, options});
+
     await page.waitForSelector('iframe');
 
     return {