PR Summary

This allows scales to be set on polar Axes where 0 is not in the valid scale limits (e.g. a log scale falls into this category). Because there is some special casing in polar radial view limits that tries to include zero all the time, I didn't want to break this, so instead I've gone for the most general check of running the interval [0, 1] through the scale's limit_range_for_scale method, and checking if a 0 comes out. If it doesn't, the deafult behaviour of the locator is used to set the view limits and nonsingular values.

Goes part way to fixing #24383

PR Checklist

Documentation and Tests

• Has pytest style unit tests (and pytest passes)
• Documentation is sphinx and numpydoc compliant (the docs should build without error).
• New plotting related features are documented with examples.

Release Notes

• New features are marked with a .. versionadded:: directive in the docstring and documented in doc/users/next_whats_new/
• API changes are marked with a .. versionchanged:: directive in the docstring and documented in doc/api/next_api_changes/
• Release notes conform with instructions in next_whats_new/README.rst or next_api_changes/README.rst