Add informative error message to simulation

[pipliggins]

Adds an error message informing users that lists of input sets cannot be used with experiments.

Fixes #5200

Important checks:

Please confirm the following before marking the PR as ready for review:

• No style issues: nox -s pre-commit
• All tests pass: nox -s tests
• The documentation builds: nox -s doctests
• Code is commented for hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.82%. Comparing base (d536255) to head (4d54de9).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5226   +/-   ##
========================================
  Coverage    98.82%   98.82%           
========================================
  Files          321      321           
  Lines        27491    27493    +2     
========================================
+ Hits         27169    27171    +2     
  Misses         322      322           

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