Removes duplicate IDs on the post list admin pages affecting various list items, selects and checkboxes:
* JavaScript duplication of the inline editing HTML for bulk editing renames various IDs to include the prefix `bulk-edit-`,
* IDs in the Category Checkbox Walker make use of `wp_unique_prefixed_id()` to avoid duplicates, resulting in a numeric suffix, and,
* the post parent dropdown for the bulk editor is given a custom ID `bulk_edit_post_parent`.
Props peterwilsoncc, sergeybiryukov, azaozz, joedolson, siliconforks, zodiac1978, rcreators.
Fixes#61014.
Built from https://develop.svn.wordpress.org/trunk@58894
git-svn-id: http://core.svn.wordpress.org/trunk@58290 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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