Revert "Prepare: run E2E smoketests with GitHub actions (#23301)" (#23553)

This reverts commit 68be3a6bcd.

e2e-tests/.ci/dashboard.entrypoint.sh

@@ -1,21 +0,0 @@
-#!/bin/bash
-set -e -u -o pipefail
-
-npm install
-
-# Run migrations. This is also a way to wait for the database to be up
-MIGRATION_ATTEMPTS_LEFT=10
-MIGRATION_ATTEMPTS_INTERVAL=10
-until npm run migrate:latest; do
-	MIGRATION_ATTEMPTS_LEFT=$((MIGRATION_ATTEMPTS_LEFT - 1))
-	[ "$MIGRATION_ATTEMPTS_LEFT" -gt 0 ] || break
-	echo "Migration script failed, sleeping $MIGRATION_ATTEMPTS_INTERVAL"
-	sleep $MIGRATION_ATTEMPTS_INTERVAL
-done
-[ "$MIGRATION_ATTEMPTS_LEFT" -gt 0 ] || {
-	echo "Migration script failed, exhausted attempts. Giving up."
-	exit 1
-}
-
-# Launch the dashboard
-exec npm run dev