Revert "rangefeed/changefeed: Enable mux rangefeeds by default." #109165
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This reverts commit de65c54.
We decided to keep these disabled for another release, to get more real-world experience with it first.
Touches #95781.
Touches #105270.
Release note (performance improvement): The following release note no longer applies: "mux range feeds reuse connection and workers across multiple range feeds. This mode is now enabled by default."