Send error message along with error flag

[jonsabados]

What does this PR do?

This sends the error message along with an error flag

Motivation

When running with universal instrumentation on were loosing error messages if lambdas are returning errors, which impacts our ability to debug issues:

With this addition the error message is retained:

Testing Guidelines

Sabotaged a lambda behind API gateway to reproduce the issue reliably, and then cloned the code, used a replace directive to import the local patched version, deployed and repeated the test (see the attached screenshot). There weren't any unit tests with coverage on the existing case so I did not add any unit testing.

Additional Notes

Types of changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Checklist

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog

[astuyve]

Thanks so much for fixing this oversight!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 80.55%. Comparing base (c3fb2ee) to head (5ec4889).

❗ Current head 5ec4889 differs from pull request most recent head 30d0b1f. Consider uploading reports for the commit 30d0b1f to get more accurate results

Files	Patch %	Lines
internal/extension/extension.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #160      +/-   ##
==========================================
- Coverage   80.86%   80.55%   -0.32%     
==========================================
  Files          13       13              
  Lines         904      905       +1     
==========================================
- Hits          731      729       -2     
- Misses        142      145       +3     
  Partials       31       31              

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