Fix virtual mocks not being unmockable after previously being mocked

[Blasz]

Summary

Fixes #8395 where virtual mocks could not be unmocked after previously being mocked.

Test plan

Repro steps are in a test case and now pass.

[codecov-io]

Codecov Report

Merging #8396 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8396      +/-   ##
==========================================
- Coverage   62.34%   62.33%   -0.02%     
==========================================
  Files         266      266              
  Lines       10738    10735       -3     
  Branches     2612     2610       -2     
==========================================
- Hits         6695     6692       -3     
  Misses       3460     3460              
  Partials      583      583

Impacted Files	Coverage Δ
packages/jest-runtime/src/index.ts	69.39% <ø> (-0.25%)	⬇️

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[SimenB]

Thanks!

[github-actions]

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