Investigate why `reconfigure` and `hup` cause downtime on multi-node Geo deployments

In #225684 (closed), we discovered that in the course of a geo HA upgrade, the reconfigure and hup puma steps are causing downtime. As far as I know this issue has not been reported in non-geo setups.

Definition of Done

• Determine why reconfigure causes an app restart in geo
• Determine why hup puma causes an app restart in geo
• Provide steps to mitigate or fix.

Background

This behavior was observed in upgrading %12.10, however the code that causes the reboot seems to also exist in %13.0 (since reconfigure and hup were run on an upgraded node.

See #225684 (closed) for more details.

CC: @jennielouie