add warning banner on non-prod IMS instances

[srabraham]

Frankenstein already added the relevant env var to prod and staging

#1366

Example below. The banner only shows up if the deployment is not prod.

[github-actions]

⚠️ Optional matrix job Py:3.14.0-alpha.1 - ubuntu-latest failed ⚠️

• tox prefix: test
• exit status: 1

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 69.15%. Comparing base (7b396e6) to head (32b3ff8).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/ims/element/_element.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1390      +/-   ##
==========================================
- Coverage   69.21%   69.15%   -0.07%     
==========================================
  Files         181      181              
  Lines        8921     8929       +8     
  Branches     1491     1493       +2     
==========================================
  Hits         6175     6175              
- Misses       2647     2654       +7     
- Partials       99      100       +1     

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