Add MOODLE_404_STABLE GHA tests #342

Job	Run time
test (8.3, main, pgsql)	4m 6s
test (8.3, main, mariadb)	4m 12s
test (8.3, MOODLE_404_STABLE, pgsql)	4m 1s
test (8.2, MOODLE_403_STABLE, pgsql)	3m 59s
test (8.2, MOODLE_402_STABLE, pgsql)	3m 59s
test (8.1, MOODLE_401_STABLE, pgsql)	4m 17s
test (8, MOODLE_400_STABLE, pgsql, xmlrpc-beta)	4m 26s
test (8, MOODLE_311_STABLE, pgsql, xmlrpc-beta)	4m 20s
test (7.4, MOODLE_310_STABLE, pgsql)	3m 57s
test (7.4, MOODLE_39_STABLE, pgsql)	3m 52s
test (7.4, MOODLE_38_STABLE, pgsql)	4m 15s
test (8.1, main, pgsql)	4m 22s
test (8.1, main, mariadb)	4m 5s
test (8.1, MOODLE_404_STABLE, pgsql)	4m 2s
test (8, MOODLE_403_STABLE, pgsql)	4m 12s
test (8, MOODLE_402_STABLE, pgsql)	3m 56s
test (7.4, MOODLE_401_STABLE, pgsql)	4m 24s
	1h 10m 25s

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