fix(bmc-explorer): pick the manager whose ManagerForServers links the explored system

[shevchenko-evgeny]

When exploring a BMC, nv_generate_exploration_report picks one ComputerSystem and one Manager, and the resulting EndpointExplorationReport pairs them as if they described the same machine. The system side is already careful: it skips
past the first member to prefer a system that actually exposes BIOS. The manager side was not — it unconditionally took managers[0].

Related issues

Add support for Supermicro GB300 NVL
Add support for PowerEdge XE9780

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
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