computer: guard the unified connect host bag against unconfigured git

The connect host bag reaches git through this.git, which throws once git
is opt-in and no factory was configured. The module path already routed
through the configured-or-disabled guard; the shell and container path,
which never used git before the connect unification, did not. Route it
through the same guard so a workspace without git keeps running commands.

Author: aron-cf

packages/computer/src/workspace.ts

@@ -862,7 +862,7 @@ export class Workspace {
             db: this.#db,
             waitUntil: this.#waitUntil,
             fs: this.#fs,
-            git: this.git,
+            git: this.#gitFactory ? this.git : DISABLED_GIT_CLIENT,
             artifacts: this.#artifacts,
           }),
       );