feat: enable forwarded ports using built-in proxy (#5673)

* feat: enable ports panel in proxy-uri patch

This makes the forwarded ports panel enabled by default.

* feat: add tunnelProvider in proxy-uri patch

This adds a `tunnelProvider` along with a `tunnelFactory` so that ports
are forwarded and use code-server's built-in proxy.

* fixup!: update import

* fix: skip uri modification if authority host match

This adds a check in our `resolveExternalUri` patch to skip modifying if
the `authority` and the `location.host` match to prevent
`localhost:<port>/proxy/<port>` from being modified.

* fixup!: refresh patch

* fixup!: move authority check up

* fixup!: remove comment

* fixup!: add trailing slash

patches/service-worker.diff

@@ -57,7 +57,7 @@ Index: code-server/lib/vscode/src/vs/server/node/webClientServer.ts
 @@ -316,6 +316,10 @@ export class WebClientServer {
  				updateEndpoint: !this._environmentService.args['disable-update-check'] ? base + '/update/check' : undefined,
  				logoutEndpoint: this._environmentService.args['auth'] && this._environmentService.args['auth'] !== "none" ? base + '/logout' : undefined,
- 				proxyEndpointTemplate: process.env.VSCODE_PROXY_URI ?? base + '/proxy/{{port}}',
+ 				proxyEndpointTemplate: process.env.VSCODE_PROXY_URI ?? base + '/proxy/{{port}}/',
 +				serviceWorker: {
 +					scope: vscodeBase + '/',
 +					path: base + '/_static/out/browser/serviceWorker.js',