Revert Standard_Basic sku type for Application Gateway (Azure#22702)

* Add new tier and sku for standard_basic

* spaces

* Revert Standard_Basic sku type for Application Gateway

Author: amperugu

specification/network/resource-manager/Microsoft.Network/stable/2022-07-01/applicationGateway.json

@@ -1292,7 +1292,6 @@
             "WAF_Medium",
             "WAF_Large",
             "Standard_v2",
-            "Standard_Basic",
             "WAF_v2"
           ],
           "x-ms-enum": {
@@ -1307,8 +1306,7 @@
             "Standard",
             "WAF",
             "Standard_v2",
-            "WAF_v2",
-            "Standard_Basic"
+            "WAF_v2"
           ],
           "x-ms-enum": {
             "name": "ApplicationGatewayTier",