feat(analyticsadmin): update the API

#### analyticsadmin:v1alpha

The following keys were added:
- schemas.GoogleAnalyticsAdminV1alphaChannelGroup.properties.primary.description
- schemas.GoogleAnalyticsAdminV1alphaChannelGroup.properties.primary.type

discovery/analyticsadmin-v1alpha.json

@@ -4457,7 +4457,7 @@
       }
     }
   },
-  "revision": "20240131",
+  "revision": "20240312",
   "rootUrl": "https://analyticsadmin.googleapis.com/",
   "schemas": {
     "GoogleAnalyticsAdminV1alphaAccessBetweenFilter": {
@@ -5904,6 +5904,10 @@
           "readOnly": true,
           "type": "string"
         },
+        "primary": {
+          "description": "Optional. If true, this channel group will be used as the default channel group for reports. Only one channel group can be set as `primary` at any time. If the `primary` field gets set on a channel group, it will get unset on the previous primary channel group. The Google Analytics predefined channel group is the primary by default.",
+          "type": "boolean"
+        },
         "systemDefined": {
           "description": "Output only. If true, then this channel group is the Default Channel Group predefined by Google Analytics. Display name and grouping rules cannot be updated for this channel group.",
           "readOnly": true,

src/apis/analyticsadmin/v1alpha.ts

@@ -1117,6 +1117,10 @@ export namespace analyticsadmin_v1alpha {
      * Output only. The resource name for this Channel Group resource. Format: properties/{property\}/channelGroups/{channel_group\}
      */
     name?: string | null;
+    /**
+     * Optional. If true, this channel group will be used as the default channel group for reports. Only one channel group can be set as `primary` at any time. If the `primary` field gets set on a channel group, it will get unset on the previous primary channel group. The Google Analytics predefined channel group is the primary by default.
+     */
+    primary?: boolean | null;
     /**
      * Output only. If true, then this channel group is the Default Channel Group predefined by Google Analytics. Display name and grouping rules cannot be updated for this channel group.
      */