fix: add jest dependency and remove extra configs from jest.config.js

[apsinghdev]

addresses: #4124

Issues: #4145 (comment)

In this PR I have removed the configurations that we don't need for now and added jest as devDependency to streamline the workflow of adding tests in MB.

After this, tests are working properly without throwing error or creating extra files.

[apsinghdev]

@walterbender Please have a look.

[omsuneri]

@apsinghdev actually to build test for platform style I require to add some more configuration that's why I had added those configuration.

[apsinghdev]

@apsinghdev actually to build test for platform style I require to add some more configuration that's why I had added those configuration.

Can you please list down the configuration you need for platformstyle and reasoning behind it?

[omsuneri]

@apsinghdev i need the test enviorment jsdom to simulate a browser environment

[apsinghdev]

@walterbender As we discussed in the last meeting, I guess, we are on the same ground regarding not adding dom env for now. So this PR is ready for review.

[walterbender]

Yes... until sort out the dependencies we'll need.

[apsinghdev]

Yes... until sort out the dependencies we'll need.

Oops! I forgot that. I'll write an issue for it. :)