Revert "Fix parallel-safety check of expressions and predicate for index builds"

Michael Paquier <michael@paquier.xyz>

Commit: e82b64a92cf5650e618b26b85ca5c0f090286bb4
Author: Michael Paquier <michael@paquier.xyz>
Date: 2024-03-06T23:31:04Z
Releases: 15.7
Revert "Fix parallel-safety check of expressions and predicate for index builds"

This reverts commit eae7be600be7, following a discussion with Tom Lane,
due to concerns that this impacts the decisions made by the planner for
the number of workers spawned based on the inlining and const-folding of
index expressions and predicate for cases that would have worked until
this commit.

Discussion: https://postgr.es/m/162802.1709746091@sss.pgh.pa.us
Backpatch-through: 12

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