Media: Do not store error messages in the image meta. The initial idea was to...

Media: Do not store error messages in the image meta. The initial idea was to (be able to) display these errors in the UI but it wasn't implemented as these errors are mostly helpful for low-level bedugging.

Fixes #40439.
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git-svn-id: https://core.svn.wordpress.org/trunk@46304 1a063a9b-81f0-0310-95a4-ce76da25c4cd