fix: clean up stale channel types before each channel type test

The 50 channel type limit is permanently saturated across parallel CI
runners. Retry alone can't help -- we need to actively free slots by
deleting non-builtin types before creating new ones.

Author: aliev

tests/test_chat_misc.py

@@ -390,9 +390,27 @@ def test_query_future_channel_bans(client: Stream, random_users):
             pass
 
 
+BUILTIN_CHANNEL_TYPES = frozenset({
+    "messaging", "livestream", "team", "gaming", "commerce",
+})
+
+
+def _cleanup_test_channel_types(client: Stream):
+    """Delete non-builtin channel types to free slots for test runs."""
+    resp = client.chat.list_channel_types()
+    for name in resp.data.channel_types:
+        if name not in BUILTIN_CHANNEL_TYPES:
+            try:
+                client.chat.delete_channel_type(name=name)
+            except Exception:
+                pass
+    time.sleep(2)
+
+
 @retry_on_transient_error()
 def test_create_channel_type(client: Stream):
     """Create a channel type with custom settings."""
+    _cleanup_test_channel_types(client)
     type_name = f"testtype{uuid.uuid4().hex[:8]}"
 
     try:
@@ -418,6 +436,7 @@ def test_create_channel_type(client: Stream):
 @retry_on_transient_error()
 def test_update_channel_type_mark_messages_pending(client: Stream):
     """Update a channel type with mark_messages_pending=True."""
+    _cleanup_test_channel_types(client)
     type_name = f"testtype{uuid.uuid4().hex[:8]}"
 
     try:
@@ -451,6 +470,7 @@ def test_update_channel_type_mark_messages_pending(client: Stream):
 @retry_on_transient_error()
 def test_update_channel_type_push_notifications(client: Stream):
     """Update a channel type with push_notifications=False."""
+    _cleanup_test_channel_types(client)
     type_name = f"testtype{uuid.uuid4().hex[:8]}"
 
     try:
@@ -484,6 +504,7 @@ def test_update_channel_type_push_notifications(client: Stream):
 @retry_on_transient_error()
 def test_delete_channel_type(client: Stream):
     """Create and delete a channel type with retry."""
+    _cleanup_test_channel_types(client)
     type_name = f"testdeltype{uuid.uuid4().hex[:8]}"
 
     client.chat.create_channel_type(