Remove eslint-plugin-jest

[SimenB]

Summary
As talked about in private, we've decided to move the eslint plugin out of this repo, and into jest-community. The new home is here: https://github.com/jest-community/eslint-plugin-jest

@jkimbo Do you want to be a collaborator on that project?

Test plan
Still green CI

[codecov-io]

Codecov Report

Merging #4867 into master will decrease coverage by 0.78%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4867      +/-   ##
==========================================
- Coverage   59.24%   58.46%   -0.79%     
==========================================
  Files         200      194       -6     
  Lines        6647     6517     -130     
  Branches        3        4       +1     
==========================================
- Hits         3938     3810     -128     
+ Misses       2709     2707       -2

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[jkimbo]

@SimenB sure, happy to be!

[cpojer]

Awesome, thanks for doing this. I would still maintain that this eslint plugin, originally built by @jkimbo, is an official part of Jest. However, because the code itself has nothing to do with Jest itself, it makes sense to live in a separate repo.

We should update the docs for Jest to encourage people to install this eslint plugin, btw.

[github-actions]

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