[API Nodes]: fixes and refactor (#11104)

* chore(api-nodes): applied ruff's pyupgrade(python3.10) to api-nodes client's to folder

* chore(api-nodes): add validate_video_frame_count function from LTX PR

* chore(api-nodes): replace deprecated V1 imports

* fix(api-nodes): the types returned by the "poll_op" function are now correct.

comfy_api_nodes/util/__init__.py

@@ -47,6 +47,7 @@ from .validation_utils import (
     validate_string,
     validate_video_dimensions,
     validate_video_duration,
+    validate_video_frame_count,
 )
 
 __all__ = [
@@ -94,6 +95,7 @@ __all__ = [
     "validate_string",
     "validate_video_dimensions",
     "validate_video_duration",
+    "validate_video_frame_count",
     # Misc functions
     "get_fs_object_size",
 ]