NodeGrantDatabaseStorage generate select with syntax error

@smustgrave Sorry, I forgot about that issue, yes it affected all Drupals, select without alias genere 'small' syntax error, sql will handle that but lose performance. Tested on big table grands with +30k items.
It can be hard to test because it works general, but only performance issue, but you can check also all query->select in core has alias, only few missing, probably in 99% cases it doesn't matter.

PR is ready

This is example raw query when you don't add alias in $query->select('node_access'), there is 2x node_access

SELECT 1 AS "expression"
FROM
"node_access" "node_access"
WHERE ("grant_view" >= '1') AND ((("nid" = '22487') AND ("langcode" = 'pl')) OR ("nid" = '0')) AND ((("gid" IN ('0')) AND ("realm" = 'all')) OR (("gid" IN ('2'));

Repeating table names 2x is a syntax error, and SQL must process it. With small queries, it's not noticeable, but we had a lot of users where grants were being generated for about 6000-8000 users at once. Without this change, the MySQL server would crash as it couldn't process the queries. Adding an alias in the code generated the correct syntax, and the problem disappeared.

Not sure it it relevant but i did some small test on small query and there is 0.0001s diffs between queries. (screen)