[DocDB] Display blocker transactions when timing out from wait-queue

[basavaraj29]

Jira Link: DB-20260

Description

When waiting requests timeout due to active blocker, the logs contain something like

Write failed: Timed out (yb/docdb/wait_queue.cc:172): Waiter transaction timed out waiting in queue, invoking callback.

It would be helpful to log the failed write's blocker transactions as well. though it would provide much visibility into which SQL statements was the blocker, it would at least provide some signal if many transactions are being blocked on a small set of transaction.

Issue Type

kind/enhancement

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