fix: #6067 - nodejs mock return error from lambda

[attilah]

Issue #, if available:

fix: #6067

Description of changes:

This fixes the error scenarios with mock when Lambda resolvers are used, either with throw or the callback('error') way.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[yuth]

LGTM. Some tests would be appreciated

[codecov]

Codecov Report

Merging #6096 (df0c116) into master (747d290) will decrease coverage by 0.00%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##           master    #6096      +/-   ##
==========================================
- Coverage   56.99%   56.99%   -0.01%     
==========================================
  Files         466      466              
  Lines       21402    21403       +1     
  Branches     4029     4030       +1     
==========================================
  Hits        12199    12199              
- Misses       8254     8255       +1     
  Partials      949      949              

Impacted Files	Coverage Δ
...es/amplify-appsync-simulator/src/velocity/index.ts	75.43% <0.00%> (ø)
...ejs-function-runtime-provider/src/utils/execute.ts	71.92% <0.00%> (-1.29%)	⬇️
...dejs-function-runtime-provider/src/utils/invoke.ts	88.23% <100.00%> (ø)

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[github-actions]

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