fix(portal): catch all errors when sending welcome email (#9776)

Why:

* We were previously only catching the `:rate_limited` error when
sending welcome emails. This update adds a catch-all case to gracefully
handle the error and alert us.

---------

Signed-off-by: Brian Manifold <bmanifold@users.noreply.github.com>
Co-authored-by: Jamil <jamilbk@users.noreply.github.com>

elixir/apps/web/lib/web/live/actors/show.ex

@@ -4,6 +4,7 @@ defmodule Web.Actors.Show do
   import Web.Clients.Components
   alias Domain.{Auth, Tokens, Flows, Clients}
   alias Domain.Actors
+  require Logger
 
   def mount(%{"id" => id}, _session, socket) do
     with {:ok, actor} <-
@@ -730,6 +731,23 @@ defmodule Web.Actors.Show do
           )
 
         {:noreply, socket}
+
+      {:error, reason} ->
+        Logger.error("Unknown error while sending welcome email",
+          account_id: socket.assigns.account.id,
+          subject_actor_id: socket.assigns.subject.actor.id,
+          identity_id: identity.id,
+          reason: inspect(reason)
+        )
+
+        socket =
+          socket
+          |> put_flash(
+            :error,
+            "Unknown error while sending welcome email. We're looking into it."
+          )
+
+        {:noreply, socket}
     end
   end