Auto merge of rust-lang#13118 - lnicola:cleanup, r=lnicola

minor: Remove unused UpdatesChannel type

Author: bors

editors/code/src/config.ts

@@ -3,8 +3,6 @@ import * as vscode from "vscode";
 import { Env } from "./client";
 import { log } from "./util";
 
-export type UpdatesChannel = "stable" | "nightly";
-
 export type RunnableEnvCfg =
     | undefined
     | Record<string, string>