feat: LoggerEmailSender send all Database.Error fields

[alanjaouen]

resolve #590

[Damecek]

This is great, just received a bunch of such messages and was clueless. This will be very handy. Good job.

[Damecek]

@jongpie happy new year, could you please check out this PR? It would really help to clarify what exactly is the root cause of errors.

[jongpie]

@alanjaouen thanks so much for working on this, and apologies for the late response (same to you @Damecek)! I haven't been able to work on open source projects for the last few months, but I am back & working on catching up on this repo, starting with this PR.

Your changes look great to me - I think the inclusion of the error fields in the email will help a lot with troubleshooting bugs. I've also added a few extra asserts in a test class to validate that the error fields are included in the emails. I'll merge & release these changes later today!

[jongpie]

@alanjaouen and @Damecek this has now officially been released as v4.12.1! 🎉🥳💃 If you have any more feedback on how to improve the error emails, please let me know.

Thanks again @alanjaouen for your work on this!