PR #110332 - rangefeed: increase the txn push interval to 1 second

[cockroach-teamcity]

Exalate commented:

Related PR: cockroachdb/cockroach#110332
Commit: cockroachdb/cockroach@fbc7f66
Epic: none

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Release note (ops change): Rangefeeds regularly attempt to push
long-running transactions to a future timestamp in order to emit
checkpoints. The interval at which this is attempted has been increased
from 250 milliseconds to 1 seconds. This is now configurable via the
environment variable COCKROACH_RANGEFEED_PUSH_TXNS_INTERVAL.

Jira Issue: DOC-8798