Previously, the PS backend would initialize certain usetex related
attributes based on rcParams["text.usetex"], causing crashes if the
rcParam is unset but a single artist sets usetex=True.

Improved version of #8329, without touching global state. I believe popping usetex from the text kwargs is not necessary as it should be handled by the t.update(kwargs) call.

Closes #7741.

edit: hum, text doesn't appear at all. probably we need to keep track of whether the renderer has any elements that use usetex and run everything through _print_figure_tex in that case. closing for now.

PR Summary

PR Checklist

• Has Pytest style unit tests
• Code is PEP 8 compliant
• New features are documented, with examples if plot related
• Documentation is sphinx and numpydoc compliant
• Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there)
• Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way