Remove invalid config option azure.managedIdentity.tenantId (#5846)

There was an additional config option for azure.managedIdentity which wasn't used anywhere. It probably crept in during development with the previous version of the SDK. We sshould remove it to prevent confusion.

Signed-off-by: adamrtalbot <12817534+adamrtalbot@users.noreply.github.com>
Co-authored-by: Ben Sherman <bentshermann@gmail.com>

docs/reference/config.md

@@ -410,9 +410,6 @@ The following settings are available:
 `azure.managedIdentity.system`
 : When `true`, use the system-assigned [managed identity](https://learn.microsoft.com/en-us/entra/identity/managed-identities-azure-resources/overview) to authenticate Azure resources. See {ref}`azure-managed-identities` for more details.
 
-`azure.managedIdentity.tenantId`
-: The Azure tenant ID
-
 `azure.registry.server`
 : Specify the container registry from which to pull the Docker images (default: `docker.io`).