1. Add a new FE config `colocate_group_relocate_delay_second`
The relocation of a colocation group may involve a large number of tablets moving within the cluster.
Therefore, we should use a more conservative strategy to avoid relocation of colocation groups as much as possible.
Relocation usually occurs after a BE node goes offline or goes down.
This config is used to delay the determination of BE node unavailability.
The default is 30 minutes, i.e., if a BE node recovers within 30 minutes, relocation of the colocation group
will not be triggered.
2. Change the priority of colocate tablet repair and balance task from HIGH to NORMAL
3. Add a new FE config allow_replica_on_same_host
If set to true, when creating table, Doris will allow to locate replicas of a tablet
on same host. And also the tablet repair and balance will be disabled.
This is only for local test, so that we can deploy multi BE on same host and create table
with multi replicas.
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