Use explicit Azure trigger sync for partial inventories

[jeremydixon22]

Summary

• replace the ineffective restart-only recovery for a persistent partial Flex inventory with Azure's explicit syncfunctiontriggers action
• keep the recovery bounded to one attempt and still require the exact packaged runtime inventory and end-to-end behaviors
• add redacted diagnostic evidence containing only public function identifiers and the deployment-attempt count
• cover immediate success, empty inventory, persistent partial inventory, successful trigger-sync recovery, and trigger-sync failure with full cleanup assertions

Evidence

• scripts/test-validate-azure-durable-functions-live.sh
• shell syntax and ShellCheck
• CI classifier/export/wrapper regression tests
• deterministic public-export rehearsal: 854 files, matching tree hashes, secret/ownership/history scans passed

The preceding hosted run deployed successfully and issued a restart, but the authenticated runtime stayed at 1 of 7 functions for more than four additional minutes. This PR uses the direct trigger-registration operation documented for that failure boundary rather than adding unbounded polling or generic retries.