Add dapr AppInsights connection string (Azure#18503)

* Add dapr AppInsights connection string

* Remove the deprecation note for now

Author: ruslany

specification/app/resource-manager/Microsoft.App/stable/2022-03-01/ManagedEnvironments.json

@@ -754,7 +754,17 @@
               "x-ms-mutability": [
                 "create",
                 "read"
-              ]
+              ],
+              "x-ms-secret": true
+            },
+            "daprAIConnectionString": {
+              "type": "string",
+              "description": "Application Insights connection string used by Dapr to export Service to Service communication telemetry",
+              "x-ms-mutability": [
+                "create",
+                "read"
+              ],
+              "x-ms-secret": true
             },
             "vnetConfiguration": {
               "description": "Vnet configuration for the environment",

specification/app/resource-manager/Microsoft.App/stable/2022-03-01/examples/ManagedEnvironments_CreateOrUpdate.json

@@ -7,6 +7,7 @@
     "environmentEnvelope": {
       "location": "East US",
       "properties": {
+        "daprAIConnectionString": "InstrumentationKey=00000000-0000-0000-0000-000000000000;IngestionEndpoint=https://northcentralus-0.in.applicationinsights.azure.com/",
         "appLogsConfiguration": {
           "logAnalyticsConfiguration": {
             "customerId": "string",