eventhub: refactoring to use go-azure-sdk

[mbfrahry]

Lift and shift

[tombuildsstuff]

👍

[tombuildsstuff]

@mbfrahry looks like we've got an error here:

panic: interface conversion: interface {} is nil, not *schema.Set
goroutine 389 [running]:
github.com/hashicorp/go-azure-helpers/resourcemanager/identity.ExpandSystemAndUserAssignedMap({0xc002760bf0, 0x1, 0x68a3080?})
  /opt/teamcity-agent/work/5e6516bb4d10eb66/vendor/github.com/hashicorp/go-azure-helpers/resourcemanager/identity/system_and_user_assigned_map.go:69 +0x434
github.com/hashicorp/terraform-provider-azurerm/internal/services/eventhub.resourceEventHubNamespaceCreate(0x0?, {0x5788be0?, 0xc00156ce00})
  /opt/teamcity-agent/work/5e6516bb4d10eb66/internal/services/eventhub/eventhub_namespace_resource.go:276 +0x59c
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*Resource).create(0xc001a51b00?, {0x68adc70?, 0xc0022d4e00?}, 0x2?, {0x5788be0?, 0xc00156ce00?})

[github-actions]

This functionality has been released in v3.13.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active contributions.
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