[#151] Refactor croncheck.php to be Check API only #264

Job	Run time
ci / check if job needs to run	4s
ci / prepare test matrix	17s
ci / MOODLE_310_STABLE - pgsql - php 7.2 - tool_heartbeat	3m 32s
ci / MOODLE_311_STABLE - mariadb - php 7.3 - tool_heartbeat	3m 5s
ci / MOODLE_39_STABLE - mariadb - php 7.2 - tool_heartbeat	3m 33s
ci / MOODLE_39_STABLE - mariadb - php 7.3 - tool_heartbeat	3m 22s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_heartbeat	3m 45s
ci / MOODLE_39_STABLE - pgsql - php 7.3 - tool_heartbeat	3m 32s
ci / MOODLE_400_STABLE - pgsql - php 7.3 - tool_heartbeat	3m 35s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_heartbeat	3m 35s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_heartbeat	4m 12s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_heartbeat	4m 34s
ci / MOODLE_39_STABLE - pgsql - php 7.2 - tool_heartbeat	3m 33s
ci / Release to the Moodle plugin directory	0s
	40m 39s

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