Print values of generated variables on uncaught exceptions

**Description**
When running data driven tests I'd find very useful to quickly understand which of the values generated by `GENERATE` produced an unexpected exception. It would then be useful to print these values in the report if possible, e.g.:

```
Scenario: Testing the GGSScdHitsReader against the GGS reader on ParametricGeo
Given: A GGS output file, a GGSScdHitsReader and a GGS reader
-------------------------------------------------------------------------------
/home/mori/analysis/HERD/HerdSoftware/testsuite/unit/dataproviders/readers/event/testGGSScdHitsReader.cpp:10
...............................................................................

/home/mori/analysis/HERD/HerdSoftware/testsuite/unit/dataproviders/readers/event/testGGSScdHitsReader.cpp:10: FAILED:
{Unknown expression after the reported line}
due to unexpected exception with message:
IntHits missing for detector topFitMatCore

Values of generated variables:
- foo =value1
- bar = value2
```

**Additional context**
Currently using Catch v2.13.8

Start by tracing Catch v2.13.8's handling of uncaught exceptions during data-driven tests and how GENERATE values are retained for reporting. Reproduce the unexpected-exception case, then verify that the report includes each generated variable and its value without changing existing failure output.

Written by the indexing model from the issue text.