If organizing uploads into month- and year-based folders, uploading an attachment to an existing post should store the file in `wp-content/uploads/<year>/<month>` based on the post's publish date. This is in line with the behavior in classic editor / the media modal.
Props swissspidy, adamsilverstein, timothyblynjacobs, skithund, sergeybiryukov, patricia70.
Fixes#61189.
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