Dashboard created on Edge syncs to CE with empty configuration and null externalId

[michalpankau]

Describe the bug
A clear and concise description of what the bug is.

Your Server Environment
Thingsboard CE : tb-node:4.3.0.1
Docker with Kafka
Ubuntu Server 24.04

Your Client Environment
Thingsboard CE Edge : 4.3.0.1EDGE
Docker
Ubuntu Server 24.04

Behavior:
Create a dashboard with widgets on Edge
Dashboard appears in main instance (ManagedByEdge relation exists ✅)
But external_id is null ❌
And configuration is {"description":""} — widgets missing ❌
Kafka tb_cloud_event shows DASHBOARD ADDED event is generated, but the entity body doesn't include the dashboard configuration.

Workaround:
Create dashboards on main instance CE and push down to Edge — this direction works correctly.

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