Tests: more time for the web offline launches and the icon review server

On a busy CI machine (several fork jobs under gVisor at once) a web
offline launch took over 90 s and the icon review server took over ~2 s
to answer. Launches now get 240 s and one retry; the review server gets
up to 60 s to start.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/tools/test_icon_export.py

@@ -84,7 +84,9 @@ class IconExportTest(unittest.TestCase):
                                     stdout=subprocess.DEVNULL, stderr=subprocess.PIPE)
             try:
                 url = 'http://127.0.0.1:%d' % port
-                for attempt in range(100):
+                # Up to a minute: CI machines can be busy enough that the server starts slowly.
+                deadline = time.monotonic() + 60
+                while time.monotonic() < deadline:
                     try:
                         with urllib.request.urlopen(url + '/api/review', timeout=1) as response:
                             base = json.load(response)