feat: Allow disabling colorized debug output

[MynockSpit]

What:

Add an environment flag that allows turning off of colors from the command line.

Why:

Some environments current flag as "node", but print logs in formats that don't handle colorization which makes reading the logs hard to read.

More details here: https://github.com/testing-library/dom-testing-library/issues/1153

How:

Changed the isNode function to shouldHighlight, and check for the environment variable before checking for the

Checklist:

• [ ] Documentation added to the docs site
• [x] Tests
• [x] TypeScript definitions updated - N/A
• [x] Ready to be merged

[codesandbox-ci[bot]]

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Latest deployment of this branch, based on commit d79febc4ad3e14fd68acf9709c1d227a9b41c2b1:

Sandbox	Source
react-testing-library-examples	Configuration

[codecov[bot]]

Codecov Report

Merging #1166 (d79febc) into main (2a9ee25) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #1166   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines          990       996    +6     
  Branches       325       327    +2     
=========================================
+ Hits           990       996    +6     

Flag	Coverage Δ
node-12	100.00% <100.00%> (ø)
node-14	100.00% <100.00%> (ø)
node-16	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pretty-dom.js	100.00% <100.00%> (ø)

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[eps1lon]

Thanks. This needs documentation to acompany it.

[MynockSpit]

I took a stab at updating the docs. Let me know what you think!

https://github.com/testing-library/testing-library-docs/pull/1148

[eps1lon]

@all-contributors add @MynockSpit for code

[allcontributors[bot]]

@eps1lon

I've put up a pull request to add @MynockSpit! :tada:

[github-actions[bot]]

:tada: This PR is included in version 8.18.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: