Add try catch to main loops on core ipn classes

[eileenmcnaughton]

Overview

Add try-catch blocks to help move away from repetitive error handling

when viewed as

https://github.com/civicrm/civicrm-core/pull/18384/files?w=1 it's not that scary

Before

Unclear how exceptions are being handled

After

Clear try-catch, with a couple of examples

Technical Details

Comments

I'm a bit torn here - it seems PaypalExpress was just letting the exceptions bubble up to the top - I think we want to log them but maybe we should re-throw & kill the echos

[civibot]

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[seamuslee001]

Yeh I think this is fine merging