Web: change `yarn web` to run with our server instead of playground (#139725)

* web - first cut `yarn web` via our server

* properly pipe output

* web - remove traces of web playground

* web - remember last opened workspace for convinience

* use vscode-test-web for server less, clean up web commands

* fix comment

* fix `yarn web`

* rename to code-server

* open system browser

* code-server script: use minimist

* test resolver: use ./scripts/code-server

* integartion tests: fix code-server command name

Co-authored-by: Martin Aeschlimann <[email protected]>