TIDB partion region scatter caller is wrong

[bufferflies]

Bug Report

In past, TIDB will scatter partition region by using different group(partition id), but pd scatter this region depence on the group.
Different group means them has no relationship.
Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

set global tidb_scatter_region=on;
select now(); 
create table test.t1(id int,b int) shard_row_id_bits=4 partition by hash(id) partitions 2000; 
select now();

2. What did you expect to see? (Required)

scatter leader and peer is ok

3. What did you see instead (Required)

scatter leader and peer can't work

4. What is your TiDB version? (Required)

above 6.2

[CabinfeverB]

/label affects-7.1

[CabinfeverB]

/label affects-6.5

[CabinfeverB]

/label severity/major

[ti-chi-bot]

@CabinfeverB: The label(s) severity/major cannot be applied. These labels are supported: fuzz/sqlancer, challenge-program, compatibility-breaker, first-time-contributor, contribution, require-LGT3, good first issue, correctness, duplicate, proposal, security, needs-more-info, needs-cherry-pick-release-5.2, needs-cherry-pick-release-5.3, needs-cherry-pick-release-5.4, needs-cherry-pick-release-6.0, needs-cherry-pick-release-6.1, needs-cherry-pick-release-6.2, needs-cherry-pick-release-6.3, needs-cherry-pick-release-6.4, needs-cherry-pick-release-6.5, needs-cherry-pick-release-6.6, needs-cherry-pick-release-7.0, needs-cherry-pick-release-7.1, needs-cherry-pick-release-7.2, needs-cherry-pick-release-7.3, affects-5.2, affects-5.3, affects-5.4, affects-6.0, affects-6.1, affects-6.2, affects-6.3, affects-6.4, affects-6.5, affects-6.6, affects-7.0, affects-7.1, affects-7.2, affects-7.3, may-affects-5.2, may-affects-5.3, may-affects-5.4, may-affects-6.0, may-affects-6.1, may-affects-6.2, may-affects-6.3, may-affects-6.4, may-affects-6.5, may-affects-6.6, may-affects-7.0, may-affects-7.1, may-affects-7.2, may-affects-7.3.

In response to this:

/label severity/major

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