During the FAILOVER process, when conditions are met (such as
when the force time is reached or the primary and replica offsets are
consistent), the primary actively becomes the replica and transitions to
the FAILOVER_IN_PROGRESS state. After the primary becomes the replica,
and after handshaking and other operations, it will eventually send the
PSYNC FAILOVER command to the replica, after which the replica will
become the primary. This means that the upgrade of the replica to the
primary is an asynchronous operation, which implies that during the
FAILOVER_IN_PROGRESS state, there may be a period of time where both
nodes are replicas. In this scenario, if a -REDIRECT is returned, the
request will be redirected to the replica and then redirected back,
causing back and forth redirection. To avoid this situation, during the
FAILOVER_IN_PROGRESS state, we temporarily suspend the clients that need
to be redirected until the replica truly becomes the primary, and then
resume the execution.

Signed-off-by: zhaozhao.zz <zhaozhao.zz@alibaba-inc.com>

Signed-off-by: zhaozhao.zz <zhaozhao.zz@alibaba-inc.com>