fix(clients): generate jest.config.js instead of extending from global config

[trivikr]

Issue

Refs: #1618

Description

Generate jest.config.js per client instead of extending from global config

Testing

CI

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[alexforsyth]

lgtm

[trivikr]

The failing S3.spec.ts was written as a jest test to start with in #1097
It was moved to karma when browser integration tests were added in #1296

As part of this PR, the unit test will be moved to use jest and ts-jest.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (main@5d9bc5f). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 6084f83 differs from pull request most recent head afa6594. Consider uploading reports for the commit afa6594 to get more accurate results

@@           Coverage Diff           @@
##             main    #2163   +/-   ##
=======================================
  Coverage        ?   48.48%           
=======================================
  Files           ?      551           
  Lines           ?    34135           
  Branches        ?     8446           
=======================================
  Hits            ?    16552           
  Misses          ?    17583           
  Partials        ?        0           

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 79cc9e2
• Result: FAILED
• Build Logs (available for 30 days)

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[trivikr]

The test failing on CI is successful in local workspace.
The PR which introduced the test which is failing #1455

[trivikr]

Superceded by #2172 because of issues with replacing mocha with jest in client-s3.

[github-actions]

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