Add MOODLE_404_STABLE GHA tests #414

Job	Run time
test (8.3, main, pgsql)	4m 19s
test (8.3, main, mariadb)	4m 14s
test (8.3, MOODLE_404_STABLE, pgsql)	6m 24s
test (8.2, MOODLE_403_STABLE, pgsql)	4m 6s
test (8.2, MOODLE_402_STABLE, pgsql)	3m 57s
test (8.1, MOODLE_401_STABLE, pgsql)	4m 35s
test (8, MOODLE_400_STABLE, pgsql, xmlrpc-beta)	4m 35s
test (8, MOODLE_311_STABLE, pgsql, xmlrpc-beta)	4m 45s
test (7.4, MOODLE_310_STABLE, pgsql)	3m 54s
test (7.4, MOODLE_39_STABLE, pgsql)	4m 2s
test (7.4, MOODLE_38_STABLE, pgsql)	4m 10s
test (8.1, main, pgsql)	4m 30s
test (8.1, main, mariadb)	4m 15s
test (8.1, MOODLE_404_STABLE, pgsql)	4m 14s
test (8, MOODLE_403_STABLE, pgsql)	5m 35s
test (8, MOODLE_402_STABLE, pgsql)	1h 10m 33s
test (7.4, MOODLE_401_STABLE, pgsql)	4m 20s
	2h 22m 28s

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