fix(amplify-appsync-simulator): bail out early on exceptions

[cjihrig]

Issue #, if available: #6640

Description of changes: This commit detects templates that use $util.error and stops execution from propagating further.

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 #6663 (dd65fd8) into master (e746d2a) will increase coverage by 0.00%.
The diff coverage is 69.23%.

@@           Coverage Diff           @@
##           master    #6663   +/-   ##
=======================================
  Coverage   56.79%   56.80%           
=======================================
  Files         486      486           
  Lines       22022    22024    +2     
  Branches     4399     4400    +1     
=======================================
+ Hits        12508    12510    +2     
  Misses       8638     8638           
  Partials      876      876           

Impacted Files	Coverage Δ
...es/amplify-appsync-simulator/src/velocity/index.ts	76.78% <25.00%> (ø)
...mplify-appsync-simulator/src/resolvers/function.ts	15.38% <50.00%> (ø)
...psync-simulator/src/resolvers/pipeline-resolver.ts	93.33% <100.00%> (+0.47%)	⬆️
...y-appsync-simulator/src/resolvers/unit-resolver.ts	89.65% <100.00%> (ø)

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[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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