Extract auto_update_ui crate (#21008)

This PR extracts an `auto_update_ui` crate out of the `auto_update`
crate.

This allows `auto_update` to not depend on heavier crates like `editor`,
which in turn allows other downstream crates to start building sooner.

Release Notes:

- N/A

Cargo.lock

@@ -1014,26 +1014,41 @@ dependencies = [
  "anyhow",
  "client",
  "db",
- "editor",
  "gpui",
  "http_client",
  "log",
- "markdown_preview",
- "menu",
  "paths",
  "release_channel",
  "schemars",
  "serde",
- "serde_derive",
  "serde_json",
  "settings",
  "smol",
  "tempfile",
- "util",
  "which 6.0.3",
  "workspace",
 ]
 
+[[package]]
+name = "auto_update_ui"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "auto_update",
+ "client",
+ "editor",
+ "gpui",
+ "http_client",
+ "markdown_preview",
+ "menu",
+ "release_channel",
+ "serde",
+ "serde_json",
+ "smol",
+ "util",
+ "workspace",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.4.0"
@@ -15464,6 +15479,7 @@ dependencies = [
  "async-watch",
  "audio",
  "auto_update",
+ "auto_update_ui",
  "backtrace",
  "breadcrumbs",
  "call",