Run jpackcore when test crashes

If there are test crashes, TKG should run `jpackcore -x `.

```
copies of executable files and libraries are required for a full analysis of a core dump (you can get some information from the dump without these files, but not as much). Run the jpackcore utility to collect these extra files and package them into an archive file along with the core dump.
```

https://www.ibm.com/docs/en/semeru-runtime-ce-z/17.0.0?topic=tools-dump-extractor

Start by locating TKG's test-crash handling and the point where core dump paths become available. Review the jpackcore documentation linked in the issue, then verify that a crashed test invokes `jpackcore -x ` and packages the required files with the core dump.

Written by the indexing model from the issue text.