pg_plan_advice: Fix failures to accept identifier keywords.

Robert Haas <rhaas@postgresql.org>

Commit: 5e72ce2467c15340026955b57ff75f75e853a766
Author: Robert Haas <rhaas@postgresql.org>
Date: 2026-03-16T18:46:50Z
pg_plan_advice: Fix failures to accept identifier keywords.

TOK_IDENT allows only non-keywords; identifier should be used
any place where either keywords or non-keywords should be accepted.
Hence, without this commit, any string that happens to be a keyword
can't be used as a partition schema, partition name, or plan name,
which is incorrect.

Author: Lukas Fittl <lukas@fittl.com>
Discussion: http://postgr.es/m/CAP53PkzKeD=t90OfeMsniYrcRe2THQbUx3g6wV17Y=ZtiwmWTQ@mail.gmail.com

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