fix(boilerplate): jest.config.js remove jsdom test env

[frankcalise]

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Please verify the following:

• [x] yarn test jest tests pass with new tests, if relevant
• [x] yarn lint eslint checks pass with new code, if relevant
• [x] yarn format:check prettier checks pass with new code, if relevant
• [x] README.md (or relevant documentation) has been updated with your changes

Describe your PR

• Closes #2605
• Better RNTL support out of box
• testEnvironment jsdom should only be used for web (which although we support, isn't our main target)

[frankcalise]

@markrickert that was a result of running yarn test from the root project dir that you hit this error?

[markrickert]

@frankcalise Sorry, false alarm... i'm getting a different error actually:

 FAIL  src/tools/demo.test.ts
  ● Test suite failed to run

    TypeError: Cannot read properties of undefined (reading 'testEnvironmentOptions')

      at new NodeEnvironment (node_modules/jest-environment-node/build/index.js:88:49)

Test Suites: 6 failed, 6 total

Though it's probably something i did in my branch.

[infinitered-circleci]

:tada: This PR is included in version 9.6.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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