Draft: Add short-circuit to stale Markdown cache reads for efficiency

Asherah Connorrequested to merge
kiv/add-short-circuit-to-markdown-cache-updates-to-avoid-write-on-get into kiv/move-read-path-markdown-cache-saves-to-a-new-ff-d-worker

What does this MR do and why?

TODO

See Planner Intelligence: markdown cache refresh wr... (#628134) for background.

See information on the current Markdown cache bump mechanism for even more background!

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