feat: add full path label tooltip for workflow filter field (#16580)

# Closes Issue: Can't distinguish between fields with identical names
(#16285)

There was a UX bug in the workflow filter interface where **two
variables coming from different steps but sharing the same field name**
were displayed identically. This made it difficult for users to tell
them apart when used in a filter group, leading to confusion when
building workflows.

---

# Fix: Add Full Path Label Tooltip for Workflow Filter Field

- Adds a **tooltip/label showing the complete path** so users can
distinguish fields from different workflow steps even if they share the
same name.

## UX Improvements
<img width="495" height="288" alt="image"
src="https://github.com/user-attachments/assets/fa26f381-835b-4d14-bf73-f04b59c8d0b5"
/>

packages/twenty-front/src/modules/workflow/workflow-variables/hooks/useStepsOutputSchema.ts

@@ -57,6 +57,8 @@ export const useStepsOutputSchema = () => {
             type: step.type,
             icon: getActionIcon(step.type),
             outputSchema: (outputSchema ?? {}) as OutputSchemaV2,
+            objectName: (step.settings?.input as { objectName?: string })
+              ?.objectName,
           };
 
           set(stepsOutputSchemaFamilyState(stepKey), stepOutputSchema);