fix: do not wait for on-event script to finish when triggering them

[TBonnin]

on-event scripts don't have output so waiting for them to finish is not necessary.
Also modifying the max duration timeout to 5mins for on-event script

How to test:

• modify your on-event script to sleep. Ex:

    const waitTime = 10;
    for (let i = 0; i < waitTime; i++) {
        await nango.log(`Countdown: ${waitTime - i}`);
        await new Promise((resolve) => setTimeout(resolve, 1000));
    }

• create/delete a connection and then check in the logs dashboard that the script is still running and you didn't have to wait for it

[linear]

NAN-2219 on-events script follow up

[TBonnin]

like all our task timeouts, this value is arbitrary. 5 mins is very generous imho

[nalanj]

Ran it, looks good!