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

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

e2e-tests/.ci/.shellcheckrc

@@ -0,0 +1,4 @@
+# SC1091: Not following: <file>
+# https://www.shellcheck.net/wiki/SC1091
+disable=SC1091
+# Used to ignore for sourcing ".e2erc*"