Added limit to number of 'available activities' list when calling an unregistered activity

[KaiStevenson]

What was changed

When emitting an 'Activity function xyz is not registered on this Worker' error, the number of activities listed in 'available activities are:' has been capped to a maximum of 10. It will be of the format 'Activity function xyz is not registered on this Worker, available activities: activity1, activity2 ... activity10 and 37 others.'

Why?

'Available activities are:' can be a useful hint as to which worker picked up the activity, and can immediately highlight problems if there are, in fact, no registered activities! But for workers with hundreds or thousands of activities registered, these logs quickly become huge, taking up too much storage and memory.

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