Replace print with serialize in ConvertAnsi plugin

[pedrottimark]

Summary

Remaining work:

• Update README.md with a few more installments
• Research trimming in HTMLElement plugin
• Improve Seq in Immutable plugin

Test plan

Existing tests

[codecov-io]

Codecov Report

Merging #4225 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #4225   +/-   ##
=======================================
  Coverage   60.13%   60.13%           
=======================================
  Files         191      191           
  Lines        6756     6756           
  Branches        6        6           
=======================================
  Hits         4063     4063           
  Misses       2690     2690           
  Partials        3        3

Impacted Files	Coverage Δ
packages/pretty-format/src/plugins/convert_ansi.js	100% <100%> (ø)	⬆️
packages/jest-cli/src/test_scheduler.js
packages/jest-cli/src/test_runner.js	28.46% <0%> (ø)

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[github-actions]

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