Minimize jest related deps

[ghost]

Description

This PR drops jest-json-schema, jest-watch-typeahead and removes the related codes and files to minimize jest related dependencies which are non-essential.

Also it removes the old integration tests which are not included in CI.
I think we can focus on more unit testing and rewrite integration tests after that.

Motivation and Context

To upgrade Jest for #356, we will face some breaking changes. To handle those changes in simpler and easier way, we can reduce the complexity for the deps when the deps are not essential.

How has this been tested?

yarn bootstrap && yarn test

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• Add tests to cover changes as needed.
• Update documentation as needed.

[codecov-commenter]

Codecov Report

Merging #357 (560aefa) into dev (519b8f8) will not change coverage.
The diff coverage is n/a.

❗ Current head 560aefa differs from pull request most recent head 88e3bf6. Consider uploading reports for the commit 88e3bf6 to get more accurate results

@@           Coverage Diff           @@
##              dev     #357   +/-   ##
=======================================
  Coverage   80.82%   80.82%           
=======================================
  Files          44       44           
  Lines        1804     1804           
  Branches      306      306           
=======================================
  Hits         1458     1458           
  Misses        345      345           
  Partials        1        1           

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[ghost]

resolved conflicts @bb111189

[ghost]

Also it removes the old integration tests which are not included in CI.
I think we can focus on more unit testing and rewrite integration tests after that.

[bb111189]

Additional commits LGTM