Add jest to babel and ts dependency prepair.

[gengjiawen]

Summary
Avoid second npm install jest by adding to initial command.

Test plan
just update readme.

[codecov-io]

Codecov Report

Merging #5201 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #5201   +/-   ##
======================================
  Coverage    60.8%   60.8%           
======================================
  Files         201     201           
  Lines        6707    6707           
  Branches        3       4    +1     
======================================
  Hits         4078    4078           
  Misses       2628    2628           
  Partials        1       1

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[github-actions]

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