Privacy: Make the deprecated `wp_get_user_request_data()` function available on front end.

Previously, it was accidentally made available only in admin context.

Follow-up to [44606], [47245].

Props garrett-eclipse, johnjamesjacoby, r-a-y, Dono12.
Fixes #49802.
Built from https://develop.svn.wordpress.org/trunk@47555


git-svn-id: https://core.svn.wordpress.org/trunk@47330 1a063a9b-81f0-0310-95a4-ce76da25c4cd