Eliminate use of `extract()` in `wp_handle_upload()`.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28450


git-svn-id: http://core.svn.wordpress.org/trunk@28277 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate use of `extract()` in `wp_handle_sideload()`.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28451


git-svn-id: http://core.svn.wordpress.org/trunk@28278 1a063a9b-81f0-0310-95a4-ce76da25c4cd