[tests] Add extra compatibility tests

Add a new test suite for graph template loading.

tests/utils.py

@@ -0,0 +1,15 @@
+from contextlib import contextmanager
+from typing import Type
+from meshroom.core import registerNodeType, unregisterNodeType
+
+from meshroom.core import desc
+
+@contextmanager
+def registeredNodeTypes(nodeTypes: list[Type[desc.Node]]):
+    for nodeType in nodeTypes:
+        registerNodeType(nodeType)
+
+    yield
+
+    for nodeType in nodeTypes:
+        unregisterNodeType(nodeType)