only flatten blockquotes, prevent flattening of other element types s…

[davidgolden]

Addresses #3689

Only flatten nested blockquotes rather than flattening all child nodes which might be relevant such as nested links.

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[felixfeng33]

Thanks for this PR, but can I close it? I'll merge your fix directly into #4174
The markdown package has undergone a major rework and now supports round-trip serialization and custom mdx nodes.

[davidgolden]

@felixfeng33 Sounds good, thanks! Looking forward to the new markdown improvements!