kvcoord, changefeedccl: Disable mux rangefeed

[miretskiy]

Disable mux rangefeed use in 23.1
This is a temporary fix to elliminate test flakes
on 23.1 release branch.

Fixes #99640
Fixes #100468
Fixes #99214
Fixes #99092

Release note: None
Release justification: 23.1 release test stability fix.

[blathers-crl]

It looks like your PR touches production code but doesn't add or edit any test code. Did you consider adding tests to your PR?

_{🦉 Hoot! I am a Blathers, a bot for CockroachDB. My owner is dev-inf.}

[cockroach-teamcity]

This change is 

[irfansharif]

Could we skip the "Fixes" moniker, for #99214 and #99092 at least? This is speculative, right? Since we don't understand whether/how mux rangefeed could cause the frontier timestamp to advance but drop the actual value updates?

[miretskiy]

Could we skip the "Fixes" moniker, for #99214 and #99092 at least? This is speculative, right? Since we don't understand whether/how mux rangefeed could cause the frontier timestamp to advance but drop the actual value updates?

I think pr description describes this as a temporary test only fix on 23.1; it doesn't describe it as a mux rangefeed fix.
The speculation, backed up by lots of evidence, is that this problem occurs only when using mux rangefeed.
Thus this target fix is to enable us to release 23.1; while keeping metamorphic on master to arrive at the actual fix at some later time.