fix(jest-runtime): prevent global module registry from leaking into isolateModules registry

[toomuchdesign]

Summary

require statement inside isolateModules callbacks are unpredictable since they do not always return a fresh copy of imported modules. Currently if global registry has the require module in cache, the cached instance is returned even within `isolateModules. Fixes: #7863

This PR ensures that require statement inside isolateModules always return a fresh copy of imported modules.

Current behaviour

const myModule = require('myModule');

jest.isolateModules(() => {
  const myIsolatedModule = require('myModule');
  // myIsolatedModule === myModule;
});

New behaviour

const myModule = require('myModule');

jest.isolateModules(() => {
  const myIsolatedModule = require('myModule');
  // myIsolatedModule !== myModule;
});

Test plan

Added relevant test in: packages/jest-runtime/src/__tests__/runtime_require_module_or_mock.test.js

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[SimenB]

good stuff, thanks! could you update the changelog as well?

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[toomuchdesign]

Hi @SimenB, I thought I did but it was still on my machine uncommitted :) Just force-pushed.

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