feat: VMFleet S2D fleet storage testing integration

[kristopherjturner]

Overview

Implement the VMFleet integration module for Storage Spaces Direct fleet-level storage testing. VMFleet generates realistic VM workload patterns across multiple VMs simultaneously, stress-testing the full S2D storage stack.

Scope

• src/tools/vmfleet.py — VMFleet orchestration wrapper (PowerShell interop)
• Fleet provisioning: create, configure, and start VMFleet across cluster nodes
• Profile-driven workload injection (read heavy, write heavy, mixed)
• Real-time metrics collection during fleet runs (IOPS, latency, throughput per node)
• Fleet teardown and cleanup automation
• Integration with core collector for result normalization

Acceptance Criteria

• VMFleet deployment and teardown fully automated via config
• Workload profiles configurable (I/O size, pattern, duration, VM count)
• Per-node and aggregate IOPS/latency captured during run
• Results stored in logs/vmfleet/ with session timestamp
• Integration with monitoring dashboards for live run visibility

Dependencies

• Parent Epic: [Epic] Load Testing Toolkit Full Build-Out #8
• Config & schema: feat: config & schema expansion for all load test profiles #9
• Core framework: feat: core framework modules (session, collector, logger, reporter) #10
• Infrastructure provisioning: feat: infrastructure provisioning for load test environments #11
• Monitoring integration: feat: monitoring dashboards and alerting for test run telemetry #16

[kristopherjturner]

Tracked in Azure DevOps: https://dev.azure.com/hybridcloudsolutions/Azure%20Local%20Load%20Tools/_workitems/edit/174