[Event Hubs] Exclude Functions Bindings from Legacy (Azure#17744)

The focus of these changes is to remove the Azure Function bindings projects
from the legacy pipeline definitions.

Author: jsquire

sdk/eventhub/ci.legacy.yml

@@ -45,6 +45,7 @@ extends:
       - Azure.Messaging.EventHubs.Processor
       - Azure.Messaging.EventHubs.Shared
       - Azure.Messaging.EventHubs.*
+      - Microsoft.Azure.WebJobs.Extensions.EventHubs
     ArtifactName: packages
     Artifacts:
     - name: Microsoft.Azure.EventHubs

sdk/eventhub/tests.legacy.yml

@@ -12,4 +12,5 @@ extends:
     - Azure.Messaging.EventHubs.Processor
     - Azure.Messaging.EventHubs.Shared
     - Azure.Messaging.EventHubs.*
+    - Microsoft.Azure.WebJobs.Extensions.EventHubs
     Clouds: 'Public,Canary'