This restores the 6.7 and below behavior for the posts endpoint which did not include sticky posts by default.
Follow-up to [59801].
Reviewed by desrosj.
Merges [60197] to the 6.8 branch.
Props nikunj8866, SirLouen, ankitmaru, wildworks, karthikeya01, Mamaduka, spacedmonkey, jorbin.
Fixes#63307. See #35907.
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