No stack trace shown when an error occurs during bootstrap

[ShaneOH]

Hey there, I noticed there was a recent commit that added some helpful debug info when the bootstrap script fails:

ef1b6b1

I found in my case, I have a large bootstrap file that's somewhat complex, and the output I got was:

./vendor/bin/phpunit --bootstrap system/bootstrap.php testing
PHPUnit 9.5.13 by Sebastian Bergmann and contributors.

Error in bootstrap script: Error:
Call to a member function query() on null

Given the complexity, this still wasn't too useful in tracing down the issue until I went in and manually added a stack trace to the error output.

Is there a reason to omit a stack trace? If not, I will happily open a PR to add it!

[sebastianbergmann]

Feel free to send a PR.

[ShaneOH]

@sebastianbergmann Great -- just opened one here! #4878