Duo Chat (Streaming): Allow WebSocket connections from WebIDE
## Problem
Trying to establish a WebSocket connection from WebIDE now fails in production. GitLab responds 404 when the VS Code Extension (Duo Chat feature) tries to establish WebSocket connection on the `/-/cable` path.

## Solution
The WebIDE runs extensions in webworkers and uses origin `https://v--0m16sjqvantffqv530b7omdisqdufdh705i91tnd8b15mlp4h3ri.cdn.web-ide.gitlab-static.net` We need to make sure that the Action Cable in the Rails backend allows connections from this origin.
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