MM-52642 CLD-6352 MM-54007 Prepare setup for Playwright pipeline (#24647)

* pipeline(playwright): prepare setup for playwright

* feedback address

* clean up readme

* Fix docker-compose command and definition for dashboard

* fix the dashboard

* ignore dashboard when formatting

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: Mario Vitale <mvitale1989@hotmail.com>

e2e-tests/.ci/server.stop.sh

@@ -1,7 +1,8 @@
 #!/bin/bash
 set -e -u -o pipefail
-cd $(dirname $0)
+cd "$(dirname "$0")"
 . .e2erc
+. .e2erc_setup
 
 mme2e_log "Stopping E2E containers"
-${MME2E_DC_SERVER} down -v
+${MME2E_DC_SERVER} down -v --remove-orphans