FIX: only expect FigureCanvas on backend module if using new style #23912
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PR Summary
This is to un-break pycharm's backend_interagg
Closes #23911
PR Checklist
Tests and Styling
pytest
passes).flake8-docstrings
and runflake8 --docstring-convention=all
).I'm not sure the best way to test this, I guess we need to make a minimal backend that does not have FigureCanvas and try push it through the machinery? Is it worth the effort?