joedolson 371495c91d Media: Allow uploading images from URLs without extensions.
Enable `download_url()` to fetch and verify file types if the URL does not contain a file extension. This allows URL downloads to handle media endpoints like istockphoto.com that use file IDs and formatting arguments to deliver images.

Props masteradhoc, mitogh, joedolson, hellofromTonya, antpb, audrasjb, navi161, dmsnell.
Fixes #54738.
Built from https://develop.svn.wordpress.org/trunk@59902


git-svn-id: http://core.svn.wordpress.org/trunk@59244 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2025-03-03 00:19:23 +00:00
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