Google Calendar widget integration

### Steps to reproduce

1. Starting in a room, clicking on the Integrations button on the iPhone app or on the Room info then Widgets on the desktop browser.
2. Choose Google Calendar integration and add calendar ID (making sure that the users emails are added)

### Outcome

I expected to open the calendar widget and see the calendar I had added.
Instead I got the error message 'This calendar could not be displayed, on the iPhone app, the browser version and the desktop app.

### Operating system

MacOS

### Browser information

Version 101.0.4951.64

### URL for webapp

https://app.element.io/#/room/!UPUcpBBXYtyCYMGwTJ:matrix.org

### Application version

Element 1.8.14 on iPhone app and Element version: 1.10.14 Olm version: 3.2.8 on Desktop app

### Homeserver

matrix.org

### Will you send logs?

No

The issue names no source files or tests. Start by reproducing the Google Calendar widget failure using the listed room, calendar ID, and client versions, then compare behavior in the iPhone app, browser, and desktop app; done when the added calendar displays instead of showing the reported error.

Written by the indexing model from the issue text.