use valid scenario and scenario_source values in tests

[cjyetman]

• related Validate matching timestamps #337
• related use demo data in test-4-analyze #338

⚠️ sorry for the unrelated whitespace changes, but might as well get rid of them while we're here

⚠️ requires webshot and phantomjs to be installed (required for exporting some plots), since the analyze test is actually doing something useful now

[github-actions]

PR Preview Action v1.4.8
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2024-12-12 08:28 UTC

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.02%. Comparing base (fd375e1) to head (5008980).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #339       +/-   ##
===========================================
+ Coverage   51.57%   81.02%   +29.45%     
===========================================
  Files          29       29               
  Lines        3205     3205               
===========================================
+ Hits         1653     2597      +944     
+ Misses       1552      608      -944     

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