feat: add ability to search workflows by Activity ID

[ItsRoy69]

Description & motivation 💭

Closes #3249

Users who encounter activity failures see ActivityId in their application logs but have no way to search for the parent workflow in the UI. This PR adds ActivityId as a searchable attribute in the workflow filter bar, allowing users to find workflows containing a specific activity by its ID.

Screenshots (if applicable) 📸

Design Considerations 🎨

Testing 🧪

How was this tested 👻

• Manual testing
• E2E tests added
• Unit tests added

Steps for others to test: 🚶🏽‍♂️🚶🏽‍♀️

1. Navigate to any namespace's workflow list page
2. Click the "Add Filter" button in the filter bar
3. Verify ActivityId appears in the dropdown (near the top, after RunId
4. Select ActivityId, enter an activity ID value, and confirm the query filters correctly
5. Toggle "View raw query" and verify the query contains ActivityId=""

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