WS-31: Submit capability request view

Another merge request, another Pyramid view; this time for submitting capability requests.

I also hooked up the front end to use the new endpoint.

Sorry for the large-ish size. If you have any questions about anything in here, let me know.

services/capability/test/conftest.py

@@ -40,11 +40,13 @@ class MockCapabilityInfo(MagicMock):
             name="null",
             steps="test",
             max_jobs=2,
+            enabled=True,
         ),
         Capability(
             name="error",
             steps="error",
             max_jobs=-1,
+            enabled=True,
         ),
     ]
     capability_requests = [
@@ -137,6 +139,6 @@ def request_null_capability() -> DummyRequest:
     mock_capability_info = MockCapabilityInfo()
     request = DummyRequest(
         capability_info=mock_capability_info,
-        capabilities=MockCapabilityService(mock_capability_info),
+        capability_service=MockCapabilityService(mock_capability_info),
     )
     return request