Remove some more "snapshot too old" vestiges.

Thomas Munro <tmunro@postgresql.org>

Commit: 9f0602539db4573b89c09abab666e85b653940bd
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2023-09-08T05:12:12Z
Releases: 17.0
Remove some more "snapshot too old" vestiges.

Commit f691f5b8 removed the logic, but left behind some now-useless
Snapshot arguments to various AM-internal functions, and missed a couple
of comments.

Reported-by: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAH2-Wznj9qSNXZ1P1uWTUD_FeaTezbUazb416EPwi4Qr_jR_6A%40mail.gmail.com

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