[eventgrid] Align tspconfig.yaml and namespace with convention (#26061)

Author: mikeharder

specification/eventgrid/Azure.Messaging.EventGrid/main.tsp

@@ -37,7 +37,7 @@ import "@azure-tools/typespec-azure-core";
 )
 @doc("Azure Messaging EventGrid Client")
 @versioned(ServiceApiVersions)
-namespace EventGrid {
+namespace Microsoft.EventGrid {
   using TypeSpec.Http;
   using TypeSpec.Rest;
   using TypeSpec.Versioning;

specification/eventgrid/Azure.Messaging.EventGrid/tspconfig.yaml

@@ -11,10 +11,11 @@ linter:
     - "@azure-tools/typespec-azure-core/all"
 options:
   "@azure-tools/typespec-autorest":
+    azure-resource-provider-folder: "data-plane"
+    emitter-output-dir: "{project-root}/.."
     examples-directory: examples
+    output-file: "{azure-resource-provider-folder}/{service-name}/{version-status}/{version}/EventGrid.json"
     omit-unreachable-types: true
-    output-file: EventGrid.json
-    emitter-output-dir: "{project-root}/../data-plane/Microsoft.EventGrid/preview/2023-06-01-preview"
   "@azure-tools/typespec-python":
     package-pprint-name: "\"Azure Event Grid\""
     package-mode: "dataplane"