As of #68831, the statements page will use the combined statements API which fetches both in-memory and persisted statements stats.

Prior to this change, both transactions and statements pages used the same state from the redux store, statements. Statements page now uses the combinedStatements API to fetch combined in-memory and persisted statement stats, which will be stored under combinedStatements.

Once txns page is also able to use the date selector, we should go back to using the same state for both txns and stmt pages, as they will share the same date range.