A range of cleanup then to thenValue fixes pending explicit deletion
A range of cleanup then to thenValue fixes pending explicit deletion

Summary: Future::then taking a value-taking function is deprecated and being deleted. This cleans up a few more callsites.

Reviewed By: yfeldblum, Orvid

Differential Revision: D13116186

fbshipit-source-id: 9586029a4fa70b438e6cf09861842a5b585da2c5

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