Cron Trait - Should use max idle seconds to auto terminate instead of max messages

[davsclaus]

See chat
https://camel.zulipchat.com/#narrow/stream/257299-camel-k/topic/Cron.20and.20duration.20max.20messages

pkg/trait/cron.go: e.ApplicationProperties["camel.main.duration-max-messages"] = "1"

Should be

pkg/trait/cron.go: e.ApplicationProperties["camel.main.duration-max-idle-seconds"] = "5"

[github-actions]

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