In `media_handle_upload()`, don't call `wp_read_image_metadata()` on things that aren't images (like videos). We never caught this error, because we are suppressing it by calling `@wp_read_image_metadata()`.

Props jrf for the initial patch.
Fixes #28907.

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Editor expand: hide TinyMCE float panels and tooltips when scrolling, props avryl, fixes #29516 for trunk.
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