Revert indexed and enlargable binary heap implementation.

Masahiko Sawada <msawada@postgresql.org>

Commit: 810f64a01567610af7b92b0de930f16f3e20064e
Author: Masahiko Sawada <msawada@postgresql.org>
Date: 2024-04-11T08:18:05Z
Releases: 17.0
Revert indexed and enlargable binary heap implementation.

This reverts commit b840508644 and bcb14f4abc. These commits were made
for commit 5bec1d6bc5 (Improve eviction algorithm in ReorderBuffer
using max-heap for many subtransactions). However, per discussion,
commit efb8acc0d0 replaced binary heap + index with pairing heap, and
made these commits unnecessary.

Reported-by: Jeff Davis
Discussion: https://postgr.es/m/12747c15811d94efcc5cda72d6b35c80d7bf3443.camel%40j-davis.com

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