Colour code wagtail editor based on environment

[stephaniehobson]

One-line summary

Colour code wagtail editor based on environment.

Significant changes and points to review

I'm hoping this will help prevent taking actions on prod when we think we're on other sites. Especially with multiple tabs open.

• add green favicon and stripe for local and dev
• add orange favicon and stripe for stage
• fallback to no changes for all other environments (prod)

Issue / Bugzilla link

n/a

Testing

[codecov]

Codecov Report

❌ Patch coverage is 68.42105% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.90%. Comparing base (881724c) to head (671dcaa).

Files with missing lines	Patch %	Lines
bedrock/cms/utils.py	44.44%	5 Missing ⚠️
bedrock/cms/wagtail_hooks.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17339      +/-   ##
==========================================
- Coverage   82.93%   82.90%   -0.03%     
==========================================
  Files         179      180       +1     
  Lines        9377     9396      +19     
==========================================
+ Hits         7777     7790      +13     
- Misses       1600     1606       +6     

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