Remove testMatch from package.json

[SimenB]

Summary
I discovered that the testMatch in the root package.json meant that a few test suites did not run.

One was simply old, so I deleted it. Then a bunch of extra files in __tests__ tried to run, so I ignored them.

But it still leaves 3 tests which fails.

Test plan
Green CI (eventually)

[SimenB]

Ok, the snapshot one was just a require -> import fix.

@mjesun Ideas about the jest-worker one?

The iterator-to-null-test I have no idea about (but is eerily familiar from lazy require PR...).

Failing tests:

• https://github.com/facebook/jest/blob/9966fc9712e328fb3e7c2c1819f19b3c72f8c145/integration_tests/__tests__/iterator-to-null-test.js
• https://github.com/facebook/jest/blob/9966fc9712e328fb3e7c2c1819f19b3c72f8c145/packages/jest-worker/src/__tests__/child.test.js

[SimenB]

On CI the worker test doesn't fail... @pedrottimark mentioned it only fails if run without -i. Is that supposed to happen?

It points to another test failing which I just didn't wait for, though, the one added in #3672 earlier today. @EnoahNetzach Could you take a look?

Screengrab from Circle for convenience:

[EnoahNetzach]

I won't have time before this weekend.
I'll be glad to help then!

[SimenB]

Rebased on master, but a new failure has snuck in, so we're still at 2 failures! The new test from #3458. /cc @felipeochoa

New screengrab:

The sourcemap test passes on node 8, but not 4 or 6

[SimenB]

Open PR for the sourcemap test: #4744.

[SimenB]

Rebased, and now we're down to the single iterator-to-null-test.js, which I have no idea how to go about fixing

[SimenB]

Rebased, and skipping the failing test. Hopefully green ci...

[codecov-io]

Codecov Report

Merging #4630 into master will increase coverage by 0.39%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4630      +/-   ##
==========================================
+ Coverage   60.35%   60.74%   +0.39%     
==========================================
  Files         198      197       -1     
  Lines        6639     6596      -43     
  Branches        4        4              
==========================================
  Hits         4007     4007              
+ Misses       2632     2589      -43

Impacted Files	Coverage Δ
packages/jest-snapshot/src/plugins.js	80% <0%> (-20%)	⬇️
...ages/jest-worker/src/__performance_tests__/test.js
packages/jest-mock/src/index.js	84.83% <0%> (+0.36%)	⬆️
packages/jest-config/src/normalize.js	92.94% <0%> (+2.13%)	⬆️

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[cpojer]

This is so good, thanks for doing this.

[github-actions]

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