support 'export default TestEnvironment'

[jeysal]

Summary

Like #7750, but for testEnvironments

Test plan

Added e2e test

[codecov-io]

Codecov Report

Merging #8163 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master    #8163   +/-   ##
=======================================
  Coverage   62.28%   62.28%           
=======================================
  Files         264      265    +1     
  Lines       10435    10435           
  Branches     2533     2534    +1     
=======================================
  Hits         6499     6499           
  Misses       3354     3354           
  Partials      582      582

Impacted Files	Coverage Δ
packages/jest-runner/src/runTest.ts	2.53% <0%> (ø)	⬆️
packages/jest-core/src/runGlobalHook.ts	0% <0%> (ø)	⬆️
packages/jest-util/src/interopRequireDefault.ts	0% <0%> (ø)

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[github-actions]

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