Improve testCloseOnUndeploy #1005

Job	Run time
CI (ubuntu-latest, 11, MSSQL-2017-latest) / Run tests	1m 28s
CI (ubuntu-latest, 11, MariaDB-10.4) / Run tests	2m 17s
CI (ubuntu-latest, 11, MSSQL-2019-latest) / Run tests	1m 35s
CI (ubuntu-latest, 11, DB2-11.5) / Run tests	11m 10s
CI (ubuntu-latest, 11, MySQL-5.7) / Run tests	1m 51s
CI (ubuntu-latest, 11, MySQL-5.6) / Run tests	1m 55s
CI (ubuntu-latest, 11, MySQL-8.0) / Run tests	2m 29s
CI (ubuntu-latest, 11, PostgreSQL-10) / Run tests	3m 49s
CI (ubuntu-latest, 11, PostgreSQL-11) / Run tests	3m 47s
CI (ubuntu-latest, 11, PostgreSQL-9) / Run tests	3m 49s
CI (ubuntu-latest, 11, SQL-templates) / Run tests	5m 42s
CI (ubuntu-latest, 21, MariaDB-10.4) / Run tests	2m 2s
CI (ubuntu-latest, 21, MSSQL-2019-latest) / Run tests	1m 26s
CI (ubuntu-latest, 21, MySQL-5.7) / Run tests	2m 28s
CI (ubuntu-latest, 21, Oracle-23) / Run tests	1m 42s
CI (ubuntu-latest, 21, PostgreSQL-11) / Run tests	3m 48s
Deploy to OSSRH / Deploy to OSSRH	51s
Deploy to OSSRH / Deploy (Oracle) to OSSRH	21s
	52m 30s

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