Remove modal mock from webhook validation tests

Tests for payload validation, label checks, and action filtering
don't reach sandbox creation code, so modal mock is unnecessary
and caused TypeError with Modal's Function objects.

Author: manascb1344

tests/test_app.py

@@ -261,8 +261,7 @@ async def test_verify_signature_bad_content_type():
 
 
 @pytest.mark.asyncio
-@patch("app.modal")
-async def test_webhook_missing_workflow_job(mock_modal):
+async def test_webhook_missing_workflow_job():
     from fastapi import HTTPException
 
     from app import github_webhook
@@ -279,8 +278,7 @@ async def test_webhook_missing_workflow_job(mock_modal):
 
 
 @pytest.mark.asyncio
-@patch("app.modal")
-async def test_webhook_missing_repository(mock_modal):
+async def test_webhook_missing_repository():
     from fastapi import HTTPException
 
     from app import github_webhook
@@ -295,8 +293,7 @@ async def test_webhook_missing_repository(mock_modal):
 
 
 @pytest.mark.asyncio
-@patch("app.modal")
-async def test_webhook_missing_labels(mock_modal):
+async def test_webhook_missing_labels():
     from fastapi import HTTPException
 
     from app import github_webhook
@@ -317,8 +314,7 @@ async def test_webhook_missing_labels(mock_modal):
 
 
 @pytest.mark.asyncio
-@patch("app.modal")
-async def test_webhook_ignores_non_modal_labels(mock_modal):
+async def test_webhook_ignores_non_modal_labels():
     from app import github_webhook
 
     body = _make_webhook_body(labels=["self-hosted", "ubuntu"])
@@ -330,8 +326,7 @@ async def test_webhook_ignores_non_modal_labels(mock_modal):
 
 
 @pytest.mark.asyncio
-@patch("app.modal")
-async def test_webhook_ignores_non_queued_action(mock_modal):
+async def test_webhook_ignores_non_queued_action():
     from app import github_webhook
 
     body = _make_webhook_body(action="started")
@@ -342,8 +337,7 @@ async def test_webhook_ignores_non_queued_action(mock_modal):
 
 
 @pytest.mark.asyncio
-@patch("app.modal")
-async def test_webhook_rejects_invalid_json(mock_modal):
+async def test_webhook_rejects_invalid_json():
     from fastapi import HTTPException
 
     from app import github_webhook
@@ -358,8 +352,7 @@ async def test_webhook_rejects_invalid_json(mock_modal):
 
 
 @pytest.mark.asyncio
-@patch("app.modal")
-async def test_webhook_rejects_invalid_repo_url(mock_modal):
+async def test_webhook_rejects_invalid_repo_url():
     from fastapi import HTTPException
 
     from app import github_webhook