Is your feature request related to a problem? Please describe.

The aforementioned cluster setting configures the functionality introduced in #83851. As is, the default disables pausing replication to followers.

Describe the solution you'd like

After additional verification, we should install a nonzero default value (strawman: 0.8) for this setting.

Describe alternatives you've considered

We could default the setting to zero in 22.2 and enable it only on-demand (i.e. in the presence of follower write overload).

Additional context

Jira issue: CRDB-17353

Epic CRDB-15069