Rename apply_at to apply_agg_at for clarity

Richard Guo <rguo@postgresql.org>

Commit: 1206df04c2001868204f3f79c48173065f3b8231
Author: Richard Guo <rguo@postgresql.org>
Date: 2025-10-14T07:35:22Z
Rename apply_at to apply_agg_at for clarity

The field name "apply_at" in RelAggInfo was a bit ambiguous.  Rename
it to "apply_agg_at" to improve clarity and make its purpose clearer.

Per complaint from David Rowley, Robert Haas.

Suggested-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CA+TgmoZ0KR2_XCWHy17=HHcQ3p2Mamc9c6Dnnhf1J6wPYFD9ng@mail.gmail.com

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