Do not serialize data image urls in content editor
What does this MR do and why?
When converting rich text back to markdown, do not use serialize data URLs, to prevent them from bloating the markdown and local storage.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #398247 (closed)