Update ticklabel alignment examples. - #32317

• Cross-reference the two (standard and mpl_toolkits) ticklabel alignment examples.
• The standard example (align_ticklabels) is specifically about left-aligned yticklabels; update the title accordingly.
• Present an alternative solution for left-aligned yticklabels, which should be more robust in practice (the padding needs to be guessed, whereas one can probably more often see what will be the widest string -- if needed, one can probably actually measure it using get_text_width_height_descent, though that would obscure the example here).

PR summary

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PR quality check

• Use an expressive title, e.g. "Fix title font property precedence"
• New and changed code is tested
• Plotting related features are demonstrated in an example
• New features and API changes have release notes
• Documentation complies with general and docstring guidelines