[Dashboard] Filters in Data Studio are different from filters in the Looker Block

It is expected that the filters have to match based on [Issue #365](https://github.com/GoogleCloudPlatform/BigQuery-Agent-Analytics-SDK/issues/365)

What is missing is that the published Looker Studio template is currently out of sync with the product_contract.yaml specification regarding page filters.

**Filters Details**
- Data Studio Dashboard
-- Date Range is the only filter across the 8 Pages

- Looker Block Dashboards Filters
-- Date - Trace ID - Agent - User ID - Span ID

Compare product_contract.yaml with the published Looker Studio template, checking the filters on each of the 8 Data Studio pages against the Looker Block dashboard filters. Confirm the intended page-filter definitions from Issue #365, then update the out-of-sync template so both dashboards expose matching filters.

Written by the indexing model from the issue text.