fix CapabilityEngine

fix CapabilityEngine to actually load the capability execution it's executing and then properly release the engine after completion

shared/workspaces/test/test_capability_engine.py

+from workspaces.capability.services.capability_info import CapabilityInfo
+from workspaces.capability.services.capability_engine import CapabilityEngine
+
+pytest_plugins = ["testing.utils.conftest"]
+
+"""
+Tests for CapabilityEngine
+"""
+
+def test_load_engine():
+    pass
+
+
+def test_execute():
+    pass
+
+
+def test_submit_workflow_request():
+    pass