test: fix unit test count checking #689

Job	Run time
ci / check if job needs to run	5s
ci / prepare test matrix	19s
ci / MOODLE_400_STABLE - pgsql - php 7.3 - tool_objectfs	3m 46s
ci / MOODLE_311_STABLE - mariadb - php 7.3 - tool_objectfs	4m 8s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - tool_objectfs	6m 3s
ci / MOODLE_310_STABLE - pgsql - php 7.2 - tool_objectfs	3m 50s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - tool_objectfs	6m 11s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - tool_objectfs	5m 49s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - tool_objectfs	7m 20s
ci / MOODLE_402_STABLE - pgsql - php 8.0 - tool_objectfs	6m 7s
ci / MOODLE_402_STABLE - mariadb - php 8.0 - tool_objectfs	6m 38s
ci / MOODLE_402_STABLE - mariadb - php 8.1 - tool_objectfs	5m 45s
ci / MOODLE_402_STABLE - pgsql - php 8.1 - tool_objectfs	5m 13s
ci / Release to the Moodle plugin directory	0s
	1h 1m 14s

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