Backfill namespace_details from namespaces
What does this MR do and why?
Backfill namespace_details from namespaces
As discussed here #358144 (comment 2803627423), we need to backfill the namespace_details table with the description, description_html and cached_markdown_version from the namespaces table where the namespace_details records are missing.
Also refer to #358144 (comment 2807780667)
Closes #576273
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