Tenant reconciler should compare local and reconciled resources on known fields only

[davidebriani]

The tenant reconciler ensures that the Astarte resources needed for a tenant to work are correctly installed/updated in the corresponding Astarte realm.

However, when comparing the definition of the desired resource with the already installed resource, Edgehog performs the comparison with a simple equality check ==:

edgehog/backend/lib/edgehog/tenants/reconciler/core.ex

Line 124 in 24e5160

defp trigger_matches?(required, existing) do

This can be problematic if Astarte introduces some new functionalities and fields on resources, so the resource exposed by Astarte contains fields that will never match the definition included in Edgehog: the tenant reconciler would thus continuously reinstall the resource, even if it should not.