Revert "Handle better implicit transaction state of pipeline mode"

Michael Paquier <michael@paquier.xyz>

Commit: 6d1183515e4fca753eea69b0349766e81248bdb4
Author: Michael Paquier <michael@paquier.xyz>
Date: 2024-11-28T00:43:24Z
Releases: 15.11
Revert "Handle better implicit transaction state of pipeline mode"

This reverts commit d77f91214fb7 on all stable branches, due to concerns
regarding the compatility side effects this could create in a minor
release.  The change still exists on HEAD.

Discussion: https://postgr.es/m/CA+TgmoZqRgeFTg4+Yf_CMRRXiHuNz1u6ZC4FvVk+rxw0RmOPnw@mail.gmail.com
Backpatch-through: 13

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