Enable asset discovery scheduling for custom platforms

[petrsnd]

Summary

Custom platforms that include a DiscoverAssets operation with a DiscoveryQuery parameter do not get asset discovery scheduling enabled in SPP. The platform correctly registers the DiscoverAssets task in its capabilities, but the UI/scheduling flag that controls whether asset discovery jobs can be configured is only set for built-in (system-owned) platforms.

Use Case

A custom platform author writes a DiscoverAssets script that enumerates assets (e.g., VMs, containers, network devices) on a target system. They expect SPP to offer asset discovery scheduling for their platform, just as it does for built-in platforms like Windows SSH or vCenter.

Current Behavior

• The DiscoverAssets task is added to the platform's operation list ✅
• The engine can execute the script if invoked ✅
• The flag that enables asset discovery scheduling in the SPP UI is not set for custom platforms ❌

Requested Behavior

• When a custom platform includes DiscoverAssets with a DiscoveryQuery parameter, SPP should enable asset discovery scheduling regardless of whether the platform is system-owned.

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