Rename OverrideSearchPath to SearchPathMatcher.

Noah Misch <noah@leadboat.com>

Commit: d3a38318ac614f20a9e2e163bba083d15be54f06
Author: Noah Misch <noah@leadboat.com>
Date: 2023-08-01T00:04:47Z
Releases: 17.0
Rename OverrideSearchPath to SearchPathMatcher.

The previous commit removed the "override" APIs.  Surviving APIs facilitate
plancache.c to snapshot search_path and test whether the current value equals
a remembered snapshot.

Aleksander Alekseev.  Reported by Alexander Lakhin and Noah Misch.

Discussion: https://postgr.es/m/8ffb4650-52c4-6a81-38fc-8f99be981130@gmail.com

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