Include exception message when generating error report

[elidrissidev]

Description (*)

Magento provides the ability to print exceptions by using Mage#printException method, which prints the exception message, the stacktrace, and any extra data provided. If Developer Mode is not active however, this information is not printed and is saved in error report files (in var/report dir). These error reports did not include the exception message if any extra data is provided, leaving out an important puzzle piece to debugging the issue.

Fixed Issues (if relevant)

1. Fixes Lost error data on SQL error #2279

Manual testing scenarios (*)

1. Make sure Developer Mode is disabled and purposefully trigger an exception (example in linked issue).
2. The error report should include enough information to debug the issue, including the exception message.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)
• Add yourself to contributors list

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Unit Test Results

1 files  ±0  1 suites  ±0   0s ⏱️ ±0s
0 tests ±0  0 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
7 runs  ±0  5 ✔️ ±0  2 💤 ±0  0 ❌ ±0 

Results for commit 24c8721. ± Comparison against base commit a11d247.