Add roots to jest.config

What does this MR do and why?

This MR addresses this issue raised by @cwoolley-gitlab where a large file being present in coverage/ caused jest to blow up:

I’m unable to run jest specs locally, getting this error:

$ yarn jest ./ee/spec/frontend/remote_development/components/common/get_project_details_query_spec.js
yarn run v1.22.19
$ yarn check-dependencies
$ scripts/frontend/check_dependencies.sh
$ jest --config jest.config.js ./ee/spec/frontend/remote_development/components/common/get_project_details_query_spec.js
Error: Cannot create a string longer than 0x1fffffe8 characters
    at Object.slice (node:buffer:646:37)
    at Buffer.toString (node:buffer:865:14)
    at Object.readFileSync (node:fs:515:41)
    at getContent (/Users/cwoolley/workspace/gitlab-development-kit/gitlab/node_modules/jest-haste-map/build/worker.js:137:22)
    at Object.worker (/Users/cwoolley/workspace/gitlab-development-kit/gitlab/node_modules/jest-haste-map/build/worker.js:165:23)
    at execFunction (/Users/cwoolley/workspace/gitlab-development-kit/gitlab/node_modules/jest-worker/build/workers/processChild.js:137:17)
    at execHelper (/Users/cwoolley/workspace/gitlab-development-kit/gitlab/node_modules/jest-worker/build/workers/processChild.js:116:5)
    at execMethod (/Users/cwoolley/workspace/gitlab-development-kit/gitlab/node_modules/jest-worker/build/workers/processChild.js:120:5)
    at process.messageListener (/Users/cwoolley/workspace/gitlab-development-kit/gitlab/node_modules/jest-worker/build/workers/processChild.js:38:7)
    at process.emit (node:events:514:28)
error Command failed with exit code 1.

Screenshots or screen recordings

This should dramatically improve the startup time for jest. By specifying roots, jest won't try to read Everything-Everywhere-All-At-Once.

Before	After

How to set up and validate locally

Run yarn run jest or yarn run jest:integration locally for a specific test file.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.