Support mocking constructor in mockImplementationOnce

[thymikee]

Summary

Mocking constructor wasn't supported inside mockImplementationOnce.
Fixes #4595.

Test plan

Added a test with mocking constructor.

[codecov-io]

Codecov Report

Merging #4599 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4599      +/-   ##
==========================================
+ Coverage   56.16%   56.17%   +<.01%     
==========================================
  Files         194      194              
  Lines        6543     6544       +1     
  Branches        3        3              
==========================================
+ Hits         3675     3676       +1     
  Misses       2867     2867              
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-mock/src/index.js	84.96% <100%> (+0.05%)	⬆️

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[cpojer]

Good fix! Thanks.

[github-actions]

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