Remove hashagg_avoid_disk_plan GUC.

Peter Geoghegan <pg@bowt.ie>

Commit: bcbf9446a2983b6452c19cc50050456be262f7c5
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2020-07-28T00:53:19Z
Releases: 14.0
Remove hashagg_avoid_disk_plan GUC.

Note: This GUC was originally named enable_hashagg_disk when it appeared
in commit 1f39bce0, which added disk-based hash aggregation.  It was
subsequently renamed in commit 92c58fd9.

Author: Peter Geoghegan
Reviewed-By: Jeff Davis, Álvaro Herrera
Discussion: https://postgr.es/m/9d9d1e1252a52ea1bad84ea40dbebfd54e672a0f.camel%40j-davis.com
Backpatch: 13-, where disk-based hash aggregation was introduced.

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