Acquire LLM token from Cloud instead of Collab for Edit Predictions (#35431)

This PR updates the Zed Edit Prediction provider to acquire the LLM
token from Cloud instead of Collab to allow using Edit Predictions even
when disconnected from or unable to connect to the Collab server.

Release Notes:

- N/A

---------

Co-authored-by: Richard Feldman <oss@rtfeldman.com>

Cargo.lock

@@ -20570,6 +20570,7 @@ dependencies = [
  "call",
  "client",
  "clock",
+ "cloud_api_types",
  "cloud_llm_client",
  "collections",
  "command_palette_hooks",
@@ -20590,7 +20591,6 @@ dependencies = [
  "menu",
  "postage",
  "project",
- "proto",
  "regex",
  "release_channel",
  "reqwest_client",