Implement last opened functionality (#4633)

* Implement last opened functionality

Fixes https://github.com/cdr/code-server/issues/4619

* Fix test temp dirs not being cleaned up

* Mock logger everywhere

This suppresses all the error and debug output we generate which makes
it hard to actually find which test has failed.  It also gives us a
standard way to test logging for the few places we do that.

* Use separate data directories for unit test instances

Exactly as we do for the e2e tests.

* Add integration tests for vscode route

* Make settings use --user-data-dir

Without this test instances step on each other feet and they also
clobber your own non-test settings.

* Make redirects consistent

They will preserve the trailing slash if there is one.

* Remove compilation check

If you do a regular non-watch build there are no compilation stats so
this bricks VS Code in CI when running the unit tests.

I am not sure how best to fix this for the case where you have a build
that has not been packaged yet so I just removed it for now and added a
message to check if VS Code is compiling when in dev mode.

* Update code-server update endpoint name

src/node/settings.ts

@@ -1,8 +1,6 @@
 import { logger } from "@coder/logger"
 import { Query } from "express-serve-static-core"
 import { promises as fs } from "fs"
-import * as path from "path"
-import { paths } from "./util"
 
 export type Settings = { [key: string]: Settings | string | boolean | number }
 
@@ -54,14 +52,5 @@ export interface UpdateSettings {
  * Global code-server settings.
  */
 export interface CoderSettings extends UpdateSettings {
-  lastVisited: {
-    url: string
-    workspace: boolean
-  }
-  query: Query
+  query?: Query
 }
-
-/**
- * Global code-server settings file.
- */
-export const settings = new SettingsProvider<CoderSettings>(path.join(paths.data, "coder.json"))