fix(amplify-velocity-template): support 'get' and 'set' of array vars

[yuth]

The implementation of set and get methods of an array in velocity is not working like in the real
environment.

fix is based on shepherdwind/velocity.js#133

fix #5741

Issue #, if available:

Description of changes:

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

[lgtm-com]

This pull request introduces 1 alert when merging 944ad7a into de79514 - view on LGTM.com

new alerts:

• 1 for Variable not declared before use

[codecov]

Codecov Report

Merging #5747 (de79514) into master (3da53b7) will increase coverage by 0.94%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5747      +/-   ##
==========================================
+ Coverage   57.21%   58.15%   +0.94%     
==========================================
  Files         474      407      -67     
  Lines       21605    18747    -2858     
  Branches     4294     3550     -744     
==========================================
- Hits        12361    10903    -1458     
+ Misses       8363     7182    -1181     
+ Partials      881      662     -219     

Impacted Files	Coverage Δ
...ckages/amplify-cli-core/src/jsonValidationError.ts	33.33% <0.00%> (-66.67%)	⬇️
...-appsync-simulator/src/velocity/util/list-utils.ts	33.33% <0.00%> (-66.67%)	⬇️
packages/amplify-cli-core/src/exitOnNextTick.ts	33.33% <0.00%> (-16.67%)	⬇️
...lify-cli/src/extensions/amplify-helpers/make-id.ts	87.50% <0.00%> (-12.50%)	⬇️
packages/amplify-cli-core/src/tags/Tags.ts	69.23% <0.00%> (-9.72%)	⬇️
...ify-codegen/src/callbacks/prePushUpdateCallback.js	58.62% <0.00%> (-3.88%)	⬇️
.../graphql-transformer-core/src/util/sanity-check.ts	11.29% <0.00%> (-3.56%)	⬇️
...s/awscloudformation/utils/auth-request-adaptors.ts	40.20% <0.00%> (-2.80%)	⬇️
...amplify-cli-core/src/feature-flags/featureFlags.ts	80.48% <0.00%> (-2.62%)	⬇️
...psync-simulator/src/velocity/util/general-utils.ts	35.61% <0.00%> (-1.37%)	⬇️
... and 129 more

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[attilah]

LGTM, tests needs a review @yuth they are failing.

[lgtm-com]

This pull request introduces 1 alert when merging 472edfd into 7a045fb - view on LGTM.com

new alerts:

• 1 for Variable not declared before use

[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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