Eliminate the use of `extract()` in `wp_insert_term()`.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28464


git-svn-id: http://core.svn.wordpress.org/trunk@28291 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `get_terms()`.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28465


git-svn-id: http://core.svn.wordpress.org/trunk@28292 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `wp_delete_term()`.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28466


git-svn-id: http://core.svn.wordpress.org/trunk@28293 1a063a9b-81f0-0310-95a4-ce76da25c4cd