Make this work in Firebase Studio

[joehan]

Bunch of changes to get the emulator UI working in Firebase Studio:

• Updates the SDK version to pick up required changes. (TODO: move this from release tag to real version before merge)
• Adds a wrapper around fetch so we can always send credentials if needed
• Preload cookies with a GET call to all .cloudworkstations.dev hosts
• Get rid of some wonky logic that was forcing firestore websocket host to be the same as the http host.

While we're here, also doing some overdue maintainence:

• Update min node version to match the rest of the Firebase world
• Update CI to use modern versions of node