Remove colors from Azure CLI text output

[Dragas]

I am appalled by the usage of colors to denote types of output in azure cli on bash. Having light background in terminals makes it impossible to read what cli is outputting.

[yonzhan]

@jiasli for awareness

[jiasli]

You may turn off color with

az config set core.no_color=true

To turn color back on, use

az config unset core.no_color

You may also switch to the experimental light theme:

az config set core.theme=light

To reset to the default dark theme, use

az config unset core.theme

This feature is not yet documented.

[Dragas]

Why is this feature enabled by default to begin with?

[jiasli]

Most users of Azure CLI are using a standard dark theme terminal to invoke Azure CLI. We are aiming to provide better readability on a dark theme terminal.

Previously the color for warning is yellow and we changed it to bright yellow because of the low accessibility of yellow on dark theme terminals, according to user experience study (#16258).

If bright yellow is not readable on PyCharm, this problem should be reported to PyCharm as well to make the visibility of bright yellow better.

We will also evaluate your feedback and make better documentation regarding this topic as well.