Enable replication separately from namespace replication (#672)

**What changed?**
temporalio/temporal#8658 pulling this change
from admin service into operator to be used by cli

**Why?**
Optimization to avoid excessive network activity when we only want
namespace replication.

**Breaking changes**
na

**Server PR**
na

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Co-authored-by: Roey Berman <[email protected]>

Author: michaely520