Amplify util mock/mock supports override

[aoi]

Description of changes

Add amplify mock supports override.ts.

Issue #, if available

aws-amplify/amplify-category-api#1659

Description of how you validated changes

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)
• New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies
• Pull request labels are added

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

[codecov-commenter]

Codecov Report

Merging #12940 (9183671) into dev (ec9a2ba) will increase coverage by 48.45%.
The diff coverage is 58.63%.

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@@             Coverage Diff             @@
##              dev   #12940       +/-   ##
===========================================
+ Coverage    0.00%   48.45%   +48.45%     
===========================================
  Files        1296      837      -459     
  Lines      149743    38046   -111697     
  Branches     1296     7748     +6452     
===========================================
+ Hits            0    18436    +18436     
+ Misses     148447    18022   -130425     
- Partials     1296     1588      +292     

Impacted Files	Coverage Δ
...y-category-function/src/commands/function/build.ts	0.00% <0.00%> (ø)
...ify-category-function/src/events/prePushHandler.ts	33.33% <0.00%> (+33.33%)	⬆️
...ider-utils/awscloudformation/utils/layerHelpers.ts	21.80% <0.00%> (+21.80%)	⬆️
...er-utils/awscloudformation/utils/storeResources.ts	30.38% <ø> (+30.38%)	⬆️
...ib/S3AndCloudFront/helpers/configure-CloudFront.js	87.06% <ø> (+87.06%)	⬆️
...lify-category-hosting/lib/S3AndCloudFront/index.js	89.65% <ø> (+89.65%)	⬆️
...ifications/src/commands/notifications/configure.ts	0.00% <0.00%> (ø)
...e/src/amplify-node-pkg-detector/lock-file-types.ts	100.00% <ø> (+100.00%)	⬆️
.../src/amplify-node-pkg-detector/yarn-lock-parser.ts	100.00% <ø> (+100.00%)	⬆️
packages/amplify-cli-core/src/constants.ts	100.00% <ø> (+100.00%)	⬆️
... and 47 more

... and 1249 files with indirect coverage changes

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