Remove redundant title attribute from `wp_star_rating()`. Hide the visible...

Remove redundant title attribute from `wp_star_rating()`. Hide the visible number of ratings from assistive technologies.

This data is redundant, as the same information is already conveyed by the text hidden with `.screen-reader-text` class.

Props afercia.
Fixes #35141.
Built from https://develop.svn.wordpress.org/trunk@36092


git-svn-id: https://core.svn.wordpress.org/trunk@36057 1a063a9b-81f0-0310-95a4-ce76da25c4cd