Allowing parallel edges in graph projection when using graph completion search (#599)

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## Description
Allows parallell edges in graph projection when using graph completion
search

## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Refactor**
- Streamlined the process for updating connections within the
application’s graph. The update now ensures that every connection is
consistently recorded and propagated without performing duplicate
checks.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

cognee/modules/graph/cognee_graph/CogneeGraph.py

@@ -35,12 +35,9 @@ class CogneeGraph(CogneeAbstractGraph):
             raise EntityAlreadyExistsError(message=f"Node with id {node.id} already exists.")
 
     def add_edge(self, edge: Edge) -> None:
-        if edge not in self.edges:
-            self.edges.append(edge)
-            edge.node1.add_skeleton_edge(edge)
-            edge.node2.add_skeleton_edge(edge)
-        else:
-            logger.debug(f"Edge {edge} already exists in the graph.")
+        self.edges.append(edge)
+        edge.node1.add_skeleton_edge(edge)
+        edge.node2.add_skeleton_edge(edge)
 
     def get_node(self, node_id: str) -> Node:
         return self.nodes.get(node_id, None)

cognee/modules/graph/cognee_graph/CogneeGraphElements.py

@@ -41,13 +41,12 @@ class Node:
             self.skeleton_neighbours.remove(neighbor)
 
     def add_skeleton_edge(self, edge: "Edge") -> None:
-        if edge not in self.skeleton_edges:
-            self.skeleton_edges.append(edge)
-            # Add neighbor
-            if edge.node1 == self:
-                self.add_skeleton_neighbor(edge.node2)
-            elif edge.node2 == self:
-                self.add_skeleton_neighbor(edge.node1)
+        self.skeleton_edges.append(edge)
+        # Add neighbor
+        if edge.node1 == self:
+            self.add_skeleton_neighbor(edge.node2)
+        elif edge.node2 == self:
+            self.add_skeleton_neighbor(edge.node1)
 
     def remove_skeleton_edge(self, edge: "Edge") -> None:
         if edge in self.skeleton_edges: