joedolson 996fe7077e Media: Render attachment custom fields for new uploads.
Initialize attachment custom fields during the `add` callback, so that fields are present as soon as an attachment is uploaded but do not refresh when field values are changed. Follow up to #40909.

Props trepmal, adamsilverstein, joedolson.
Fixes #58051.
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git-svn-id: http://core.svn.wordpress.org/trunk@55161 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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