pretty-format: replace left-pad with String.prototype.padStart()

[sidoruk-sv]

fix #8516

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[jeysal]

Thanks a lot! Did you run Yarn to update the lockfile?
Also note that I think there's also a dependency on left-pad via an outdated jsdom, so until we can update that users will probably still see warnings sometimes

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[codecov-io]

Codecov Report

Merging #8517 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8517   +/-   ##
=======================================
  Coverage   60.56%   60.56%           
=======================================
  Files         269      269           
  Lines       11045    11045           
  Branches     2690     2690           
=======================================
  Hits         6689     6689           
  Misses       3770     3770           
  Partials      586      586

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[sidoruk-sv]

@jeysal yarn.lock updated too

[jeysal]

Thanks! Should wait for #8455 then we can merge this. (padStart is Node 8+)

[SimenB]

Oh sorry, I forgot about this PR 😬 I fixed it as part of #8850

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