fix(issues): Show exception for issues with threads

[armenzg]

In #29532, we decided not to show the stack trace when threads are shown in the issue.

We want to add it back since events are grouped by the stack trace.

The original comment says that the stack trace should be found within the threads but the case I investigated did not reflect this.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Additional details and impacted files

:loudspeaker: Thoughts on this report? Let us know!

[getsantry[bot]]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀