fix: expose vm context directly from test envs

[SimenB]

Summary

I've been looking into ES Modules and what it'd take, and one thing is passing in a context when constructing it (see https://nodejs.org/api/vm.html#vm_class_vm_module). Since I've just added compileFunction next to runScript adding yet another function seemed silly. So I've removed compileFunction (never released anyways) and added a method which exposes the raw vm.Context. This matches what JSDOM has done (which I suppose is the motivation for the original runScript implementation - JSDOM previously only had runVMScript()), see jsdom/jsdom#2768. Note that we cannot upgrade to JSDOM@16 yet since they've dropped support for Node 8. I've created https://www.npmjs.com/package/jest-environment-jsdom-sixteen though (which currently has compileFunction - I'll change to getVmContext shortly).

Relates to #9252.

Test plan

Green CI

[codecov-io]

Codecov Report

Merging #9428 into master will decrease coverage by 0.01%.
The diff coverage is 28.57%.

@@            Coverage Diff             @@
##           master    #9428      +/-   ##
==========================================
- Coverage   65.04%   65.03%   -0.02%     
==========================================
  Files         283      283              
  Lines       12088    12093       +5     
  Branches     2983     2984       +1     
==========================================
+ Hits         7863     7865       +2     
- Misses       3589     3591       +2     
- Partials      636      637       +1

Impacted Files	Coverage Δ
packages/jest-runner/src/runTest.ts	2.19% <ø> (ø)	⬆️
packages/jest-environment-node/src/index.ts	56.41% <0%> (+5.24%)	⬆️
packages/jest-runtime/src/index.ts	64.5% <30.76%> (-0.94%)	⬇️

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[SimenB]

#9431 (comment) ditto

[github-actions]

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