feat(pretty-format): expose ConvertAnsi plugin

[SimenB]

Summary

This is the only builtin plugin that's not enabled by default, and having an official way of retrieving it (at least from JS config) seems like a good idea.

E.g. https://github.com/jest-community/jest-watch-typeahead/blob/b08ae652f0c2c35f179d5f5578385fc85973dba4/package.json#L84 can stop reaching into build, which is not supported.

Test plan

Green CI

[codecov-commenter]

Codecov Report

Merging #12308 (1efd137) into main (94a6752) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main   #12308   +/-   ##
=======================================
  Coverage   67.25%   67.25%           
=======================================
  Files         329      329           
  Lines       17346    17346           
  Branches     5074     5074           
=======================================
  Hits        11666    11666           
  Misses       5648     5648           
  Partials       32       32           

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[github-actions]

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