Fix find tool filters by mapping many-to-one relations to fieldId (#15716)

**Root Cause**  
Many-to-one relation filters were being exposed under the relation name
(e.g., `company`) instead of the corresponding foreign-key attribute
(e.g., `companyId`).

**Change**  
- Detect many-to-one relation metadata and remap those filter keys to
`<fieldName>Id`.
- Removed some unused code unrelated to this fix.

packages/twenty-server/src/engine/metadata-modules/flat-agent/utils/transform-standard-agent-definition-to-flat-agent.util.ts

@@ -7,11 +7,8 @@ export const transformStandardAgentDefinitionToFlatAgent = (
   standardAgentDefinition: StandardAgentDefinition,
   workspaceId: string,
 ): FlatAgent => {
-  const {
-    createHandoffFromDefaultAgent: _createHandoffFromDefaultAgent,
-    standardRoleId: _standardRoleId,
-    ...agentData
-  } = standardAgentDefinition;
+  const { standardRoleId: _standardRoleId, ...agentData } =
+    standardAgentDefinition;
 
   return {
     ...agentData,