MM-60980: Add RemoteClusterInvite.IsValid (#28624)

Co-authored-by: Mattermost Build <build@mattermost.com>

server/i18n/en.json

@@ -2754,6 +2754,10 @@
     "id": "api.remote_cluster.cluster_not_deleted",
     "translation": "Remote cluster has not been deleted"
   },
+  {
+    "id": "api.remote_cluster.create_invite_error",
+    "translation": "Could not create remote cluster invite"
+  },
   {
     "id": "api.remote_cluster.delete.app_error",
     "translation": "We encountered an error deleting the secure connection."
@@ -9614,6 +9618,18 @@
     "id": "model.reaction.is_valid.user_id.app_error",
     "translation": "Invalid user id."
   },
+  {
+    "id": "model.remote_cluster_invite.is_valid.remote_id.app_error",
+    "translation": "Invalid remote id."
+  },
+  {
+    "id": "model.remote_cluster_invite.is_valid.site_url.app_error",
+    "translation": "Invalid site url."
+  },
+  {
+    "id": "model.remote_cluster_invite.is_valid.token.app_error",
+    "translation": "Invalid token."
+  },
   {
     "id": "model.reporting_base_options.is_valid.bad_date_range",
     "translation": "Date range provided is invalid."