Evaluate PPAF orchestrated region markdown on request timeouts

## Summary

Evaluate per-partition-automatic-failover (PPAF) orchestrated region markdown behavior when request timeouts occur.

## Details

- Determine the correct PPAF region markdown behavior when a request times out
- Define whether request timeouts should trigger region markdown or be treated as transient
- Implement the appropriate handling for timeout scenarios in the PPAF orchestration logic

## Motivation

Request timeouts are a common failure mode and the PPAF behavior on timeouts needs to be explicitly defined to avoid incorrect failover decisions.