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PR Summary
We must not try to make a toolbar for the classes in backend_webaggcore because
ipympl inherits from these classes and requires its own toolbar to be used.
This also fixes the webagg embedding example without breaking ipympl.
closes #23699
PR Checklist
Tests and Styling
pytest
passes).flake8-docstrings
and runflake8 --docstring-convention=all
).