Fix truncated results

[bboure]

Issue #, if available:
#4439

Description of changes:
As per NodeJs doc:

Calling process.exit() will force the process to exit as quickly as possible even if there are still asynchronous operations pending that have not yet completed fully, including I/O operations to process.stdout and process.stderr.

This causes sometimes the output to be truncated, making JSON.parse fail, when the output has not been completely processed.

I changed process.exit for https://github.com/cowboy/node-exit which ensures that stdout is fully drained.

After testing it, this solution seems to work.

Credits: This comment helped:
sindresorhus/execa#130 (comment)

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

[codecov]

Codecov Report

Merging #5107 into master will increase coverage by 0.00%.
The diff coverage is 50.00%.

@@           Coverage Diff            @@
##           master    #5107    +/-   ##
========================================
  Coverage   61.37%   61.38%            
========================================
  Files         374      374            
  Lines       16556    16557     +1     
  Branches     3288     3108   -180     
========================================
+ Hits        10162    10163     +1     
- Misses       5885     5904    +19     
+ Partials      509      490    -19     

Impacted Files	Coverage Δ
...ejs-function-runtime-provider/src/utils/execute.ts	74.54% <50.00%> (+0.47%)	⬆️
packages/amplify-util-mock/src/api/api.ts	0.00% <0.00%> (ø)
packages/graphql-mapping-template/src/print.ts	34.65% <0.00%> (ø)
packages/amplify-util-mock/src/storage/storage.ts	0.00% <0.00%> (ø)
...ges/amplify-util-mock/src/CFNParser/stack/index.ts	0.00% <0.00%> (ø)
...es/amplify-util-mock/src/api/resolver-overrides.ts	0.00% <0.00%> (ø)
...es/graphql-transformer-core/src/stripDirectives.ts	35.29% <0.00%> (ø)
.../amplify-util-mock/src/utils/lambda/loadMinimal.ts	0.00% <0.00%> (ø)
...graphql-transformer-core/src/TransformerContext.ts	26.10% <0.00%> (ø)
...mplify-appsync-simulator/src/resolvers/function.ts	15.38% <0.00%> (ø)
... and 9 more

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[edwardfoyle]

LGTM. Thanks for another contribution @bboure!

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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