Follow-up on #86325.

The v1 of the transaction workload insight details page only includes information available on contention for individual transaction executions recorded in the crdb_internal.transaction_contention_events table. As most transaction statistics are aggregated across multiple transaction executions, there are some data that product requested on the page that are missing in the v1, most notably: end time, rows processed, priority, full scan, retry count, last retry reason, session id, contended row view (column values).

Jira issue: CRDB-18744

Epic CRDB-20388