[Feature flag] Removal of `markdown_image_attributes`
What does this MR do and why?
Remove the feature flag markdown_image_attributes
to enable all relevant code.
Flag initially added in !104904 (merged)
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 #384729 (closed) and #28118 (closed)
Edited by Brett Walker