Fix regression in mockReturnValueOnce

[thymikee]

Summary

Simplified the logic behind mockReturnValueOnce and mockReturnValue so that isReturnValueLastSet flag is only set by mockReturnValue.
Fixes #3826

Test plan

Added test for that.

[codecov-io]

Codecov Report

Merging #3857 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3857      +/-   ##
==========================================
- Coverage   57.63%   57.63%   -0.01%     
==========================================
  Files         194      194              
  Lines        6782     6781       -1     
  Branches        6        6              
==========================================
- Hits         3909     3908       -1     
  Misses       2870     2870              
  Partials        3        3

Impacted Files	Coverage Δ
packages/jest-mock/src/index.js	91.89% <100%> (-0.04%)	⬇️

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[github-actions]

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