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/routes/pathProxy.ts

@@ -3,8 +3,7 @@ import * as path from "path"
 import * as qs from "qs"
 import * as pluginapi from "../../../typings/pluginapi"
 import { HttpCode, HttpError } from "../../common/http"
-import { normalize } from "../../common/util"
-import { authenticated, ensureAuthenticated, redirect } from "../http"
+import { authenticated, ensureAuthenticated, redirect, self } from "../http"
 import { proxy as _proxy } from "../proxy"
 
 const getProxyTarget = (req: Request, passthroughPath?: boolean): string => {
@@ -25,7 +24,7 @@ export function proxy(
   if (!authenticated(req)) {
     // If visiting the root (/:port only) redirect to the login page.
     if (!req.params[0] || req.params[0] === "/") {
-      const to = normalize(`${req.baseUrl}${req.path}`)
+      const to = self(req)
       return redirect(req, res, "login", {
         to: to !== "/" ? to : undefined,
       })