[24.0] Include traceback when logging email PJA exception

[mvdbeek]

The exception that is logged currently is:

EmailAction PJA Failed, exception: 'NoneType' object has no attribute 'name'

The unepxected NoneType is probably job.history, but hard to know.

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

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• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.