WebSockets Next: perform client connection cleanup during app shutdown

[mkouba]

See also the following discussion on zulip: https://quarkusio.zulipchat.com/#narrow/channel/187030-users/topic/websockets-next.20client.20connector.20can.20leak.20vert.2Ex.20clients/with/522357745

[mkouba]

This PR does not solve the problem mentioned in the zulip discussion; the eclipse-vertx/vert.x#5609 should, but I think that it's correct and the quarkus.websockets-next.client.connection-idle-timeout might be useful.

[quarkus-bot]

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[quarkus-bot]

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[github-actions]

🎊 PR Preview 4e66327 has been successfully built and deployed to https://quarkus-pr-main-48254-preview.surge.sh/version/main/guides/

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