Modify PPAF orchestrated region markdown to react to only success or non-transient failure codes

[jeet1995]

Summary

Modify per-partition-automatic-failover (PPAF) orchestrated region markdown logic to only react to success status codes or non-transient failure codes.

Details

• Currently, PPAF region markdown may react to transient failures, which can cause unnecessary failover orchestration
• Change the markdown evaluation logic to only trigger on:
  • Success status codes
  • Non-transient failure codes (permanent errors)
• Transient errors should not cause region markdown, as they are expected to resolve on retry

Motivation

Prevents unnecessary PPAF region markdown on transient errors, reducing false-positive partition-level failovers and improving stability.