[V2.0.0] Can not exit process via ctrl+c cause of BullMQ Worker

[tianyingchun]

Describe the bug
[V2.0.0] Can not correct exit process via ctrl+c cause of BullMQ Worker

Expected behavior
A clear and concise description of what you expected to happen.

Environment (please complete the following information):

• @vendure/core version: 2.0.0
• Nodejs version: 18
• Database (mysql/postgres etc):mysql

Additional context
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[is0utfitters]

I believe this issue should still be open - the logging occurs correctly without erroring since your initial fix, but the processes still hang, leaving the ports in use etc. Not sure if this is how you should correct this issue, but I was able to correct the behavior by adding a process.exit(0) after your promise.all in the destroy() method of the BullMQJobQueueStrategy class. Let me know if you think we should open a new issue with a better description and a new PR.