add database functions for upgrade code to moodle_core_repository.php #255

Job	Run time
test (8.1, MOODLE_401_STABLE, pgsql, false)	3m 58s
test (8.1, MOODLE_401_STABLE, mariadb, false)	3m 44s
test (8.1, MOODLE_402_STABLE, pgsql, false)	3m 10s
test (8.1, MOODLE_402_STABLE, mariadb, false)	3m 13s
test (8.1, MOODLE_403_STABLE, pgsql, false)	4m 0s
test (8.1, MOODLE_403_STABLE, mariadb, false)	3m 55s
test (8.1, MOODLE_404_STABLE, pgsql, false)	3m 55s
test (8.1, MOODLE_404_STABLE, mariadb, false)	3m 53s
test (8.2, MOODLE_402_STABLE, pgsql, false)	3m 19s
test (8.2, MOODLE_402_STABLE, mariadb, false)	3m 12s
test (8.2, MOODLE_403_STABLE, pgsql, false)	3m 48s
test (8.2, MOODLE_403_STABLE, mariadb, false)	3m 49s
test (8.2, MOODLE_404_STABLE, pgsql, false)	4m 1s
test (8.2, MOODLE_404_STABLE, mariadb, false)	3m 51s
test (8.3, MOODLE_404_STABLE, pgsql, false)	3m 51s
test (8.3, MOODLE_404_STABLE, mariadb, false)	3m 44s
test (8.3, main, mariadb, true)	4m 18s
	1h 3m 41s

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