Change the additional information when an activity fails

[benmoriceau]

When a sync fails because there is a technical error from an activity we display a generic message:

Additional Failure Information: Setting attempt to FAILED because the temporal workflow for this connection was restarted, and existing job state was cleaned.

This is not specific enough and it is hard for the support team to understand which error is actually happening.

We need to change this message in order to make sure it includes:

• The activity name
• The main exception message if retrievable.