Replace fictional fastlane action with Spaceship build-processing poll

The Fastfile called wait_for_build_processing_to_be_complete, which
isn't a built-in fastlane action and isn't published as a plugin
anywhere on rubygems. The submit_review lane has therefore failed
on every release that reached it (v0.1.65-beta.1, v0.1.66, v0.1.67).

Replace it with a direct Spaceship::ConnectAPI poll: fetch the build
matching the latest TestFlight build number, wait until its
processing_state is VALID, then hand off to deliver. 30-minute cap
with a clear failure message on INVALID/FAILED or timeout. Spaceship
ships with fastlane so no plugin or extra gem is required.

Lands in the next release; v0.1.67 needs a manual review submission
from App Store Connect.

packages/app/fastlane/Fastfile

@@ -16,11 +16,34 @@ platform :ios do
       app_identifier: APP_IDENTIFIER,
     )
 
-    wait_for_build_processing_to_be_complete(
-      api_key: api_key,
-      app_identifier: APP_IDENTIFIER,
-      build_number: build_number.to_s,
+    require "spaceship"
+    Spaceship::ConnectAPI.token = Spaceship::ConnectAPI::Token.create(
+      key_id: ENV.fetch("ASC_KEY_ID"),
+      issuer_id: ENV.fetch("ASC_ISSUER_ID"),
+      filepath: ENV.fetch("ASC_KEY_P8"),
     )
+    app = Spaceship::ConnectAPI::App.find(APP_IDENTIFIER)
+    UI.user_error!("Could not find app #{APP_IDENTIFIER} on App Store Connect") if app.nil?
+
+    deadline = Time.now + (30 * 60)
+    loop do
+      builds = Spaceship::ConnectAPI::Build.all(
+        app_id: app.id,
+        filter: { "version" => build_number.to_s },
+        includes: "preReleaseVersion",
+      )
+      build = builds.find { |b| b.pre_release_version&.platform == "IOS" }
+      state = build&.processing_state
+      UI.message("Build #{build_number} processing state: #{state || 'unknown'}")
+      break if state == "VALID"
+      if state == "INVALID" || state == "FAILED"
+        UI.user_error!("Build #{build_number} failed App Store processing (state: #{state}).")
+      end
+      if Time.now > deadline
+        UI.user_error!("Timed out waiting for build #{build_number} to finish processing on App Store Connect.")
+      end
+      sleep(30)
+    end
 
     deliver(
       api_key: api_key,