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-front/src/modules/ai/utils/hasStructuredStreamData.ts

@@ -1,14 +0,0 @@
-export const hasStructuredStreamData = (data: string): boolean => {
-  if (!data.includes('\n')) {
-    return false;
-  }
-
-  return data.split('\n').some((line) => {
-    try {
-      JSON.parse(line);
-      return true;
-    } catch {
-      return false;
-    }
-  });
-};