[fix](fe) LIST partition table support modify default bucket num

[htyoung]

Proposed changes

bp #39696

Issue Number: close #39684

CREATE TABLE `test1` (
    `id1` VARCHAR(255) NULL COMMENT 'id1',
    `id2` VARCHAR(255) NULL COMMENT 'id2',
    `event_time` VARCHAR(255) NULL COMMENT '事件时间',
    `event_date` VARCHAR(255) NULL COMMENT '事件日期',
    `event_ts` VARCHAR(256) NULL COMMENT '事件发生时间戳(毫秒)',
    `dt` VARCHAR(255) NOT NULL COMMENT '日期分区',
    `hr` VARCHAR(255) NOT NULL COMMENT '小时分区'
  ) ENGINE = OLAP DUPLICATE KEY(`id1`) COMMENT 'xxx' PARTITION BY LIST(`dt`, `hr`) (
    PARTITION p2024082021 VALUES IN (("2024-08-20", "21"))
  ) DISTRIBUTED BY HASH(`dt`, `hr`) BUCKETS 2 PROPERTIES (
    "replication_allocation" = "tag.location.default: 1",
    "min_load_replica_num" = "-1",
    "is_being_synced" = "false",
    "storage_medium" = "hdd",
    "storage_format" = "V2",
    "inverted_index_storage_format" = "V1",
    "light_schema_change" = "true",
    "disable_auto_compaction" = "false",
    "enable_single_replica_compaction" = "false",
    "group_commit_interval_ms" = "10000",
    "group_commit_data_bytes" = "134217728"
  );

1. 修改前表已有分区的bucket num为2
   

2. 修改List分区表bucket num（从2 -> 4）
   

3. 修改List分区后，添加的新分区bucket num为4
   

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[morningman]

LGTM, please add unit test

[morningman]

LGTM

[morningman]

run buildall

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.

[dataroaring]

Please insert values to table and alter bucket and check values.

[dataroaring]

Why is the pr not go to master?

[htyoung]

Why is the pr not go to master?

master branch has another same pr #39696

[htyoung]

Please insert values to table and alter bucket and check values.

I have updated the regression-test suit

[morningman]

run buildall