Add no-color support for atmos

[samtholiya]

what

• We are adding support for no color output for atmos

why

• Customer having custom terminal find it difficult to look at the content. Having no color option helps customer to have a visible output

references

• --no-color should be a global flag #1224

Summary by CodeRabbit

• New Features

  • Added a global --no-color flag to disable colored output in logs and terminal display.
  • Introduced a no_color configuration option with environment variable support (ATMOS_NO_COLOR, NO_COLOR).

• Bug Fixes

  • Fixed removal of ANSI color codes from logs and markdown rendering when color output is disabled.

• Documentation

  • Updated CLI help texts and configuration docs to include the new no_color option and flag usage.

• Tests

  • Added tests validating the --no-color flag, configuration parsing, and markdown rendering without color.
  • Included new snapshot tests and support command test cases.

• Refactor

  • Replaced previous color-related configuration fields with the new no_color setting for clarity and consistency.

[codecov]

Codecov Report

Attention: Patch coverage is 72.46377% with 19 lines in your changes missing coverage. Please review.

Project coverage is 34.83%. Comparing base (9ee823d) to head (765da27).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/ui/markdown/renderer.go	75.00%	8 Missing and 4 partials ⚠️
cmd/validate_editorconfig.go	0.00%	2 Missing and 2 partials ⚠️
pkg/config/config.go	40.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1227      +/-   ##
==========================================
+ Coverage   33.74%   34.83%   +1.09%     
==========================================
  Files         229      229              
  Lines       24573    24611      +38     
==========================================
+ Hits         8291     8573     +282     
+ Misses      15060    14791     -269     
- Partials     1222     1247      +25     

Flag	Coverage Δ
unittests	34.83% <72.46%> (+1.09%)	⬆️

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[mergify]

💥 This pull request now has conflicts. Could you fix it @samtholiya? 🙏