Add another *ExprWithBlock* test for try blocks

[scottmcm]

Looking to address this open item from #31436

Add a test confirming that it's an ExprWithBlock, so works in a match arm without a comma

It turns out that #120540 addressed that one, but it made me think of this other case that probably ought to have some kind of test as well.

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[Kivooeo]

A bit wonder about why edition 2018