Makes agents work pool aware (#8222)

Co-authored-by: Chris White <chris@prefect.io>

src/prefect/cli/deployment.py

@@ -619,6 +619,15 @@ async def apply(
             app.console.print(
                 f"$ prefect agent start -q {deployment.work_queue_name!r}", style="blue"
             )
+        elif deployment.work_pool_name is not None:
+            app.console.print(
+                "\nTo execute flow runs from this deployment, start an agent "
+                f"that pulls work from the {deployment.work_pool_name!r} work pool:"
+            )
+            app.console.print(
+                f"$ prefect agent start --pool {deployment.work_pool_name!r}",
+                style="blue",
+            )
         else:
             app.console.print(
                 "\nThis deployment does not specify a work queue name, which means agents "