unit testing logging for folks who are color blind

[graciegoheen]

Is this your first time submitting a feature request?

• I have read the expectations for open source contributors
• I have searched the existing issues, and I could not find an existing issue for this feature
• I am requesting a straightforward extension of existing dbt functionality, rather than a Big Idea better suited to a discussion

Describe the feature

Currently, our unit testing diff logging uses red and green color scheme, which is not readable for folks who are color blind.

Is it possible to support a different color palette or syntax highlighting for folks who are color blind?

Related slack thread