Respect $NO_COLOR

[kpbaks]

NO_COLOR is somewhat of a standard defined in https://no-color.org/.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[KatrinaHoffert]

Approving, but please note that you must sign the CLA for this to merge.

[kpbaks]

I have signed the CLA now. Will the bot pick up on it, and restart the CI pipeline?

[KatrinaHoffert]

@kpbaks I triggered a rerun but it's still failing. Please see https://github.com/google/keep-sorted/pull/130/checks?check_run_id=85450029352 for troubleshooting (there's also a link there you can use to trigger a rerun yourself).