fix: refund error handling

[ipierago]

What was changed

The catch clause for errors in the refund activity was moved.

Why?

When the refund activity executes successfully, it throws an error to indicate that the workflow has failed but that the funds were refunded. However, this error is caught by another catch clause and subsequently rethrown with additional error information. This second catch clause is intended to catch errors in the refund activity, but it is in the wrong place.

The result is that if the refund succeeds, the workflow result has the confusing message that the refund both failed and succeeded.

Checklist

How was this tested:
Follow the instructions in the temporarl documentation on how to simulate a failed deposit.

1. replace the BankService deposit call with depositThatFails in activities.ts
2. modify the maximumAttempts to 3 in workflows.ts
3. npm run client
   The resulting error message is that the deposit failed but the refund was successfully executed.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[tomwheeler]

Hi @ipierago. Thank you for your contribution. I evaluated the PR and agree with the solution. If you could sign our Contributor License Agreement, I will be able to merge this.