branch-4.0: [feat](load) introduce load job system table (#57421)

[sollhui]

pick #57421

Introduce load job statistic system table:

mysql> show create table information_schema.load_jobs\G
*************************** 1. row ***************************
       Table: load_jobs
Create Table: CREATE TABLE `load_jobs` (
  `JOB_ID` text NULL,
  `LABEL` text NULL,
  `STATE` text NULL,
  `PROGRESS` text NULL,
  `TYPE` text NULL,
  `ETL_INFO` text NULL,
  `TASK_INFO` text NULL,
  `ERROR_MSG` text NULL,
  `CREATE_TIME` text NULL,
  `ETL_START_TIME` text NULL,
  `ETL_FINISH_TIME` text NULL,
  `LOAD_START_TIME` text NULL,
  `LOAD_FINISH_TIME` text NULL,
  `URL` text NULL,
  `JOB_DETAILS` text NULL,
  `TRANSACTION_ID` text NULL,
  `ERROR_TABLETS` text NULL,
  `USER` text NULL,
  `COMMENT` text NULL,
  `FIRST_ERROR_MSG` text NULL
) ENGINE=SCHEMA;
1 row in set (0.01 sec)

User can use the select * from information_schema.load_jobs instead of the show load. The advantage is that SQL can be very flexible in locating jobs.

Example:

mysql> SELECT * FROM          information_schema.load_jobs     WHERE          LABEL = 'test_load_job_label_b5347e94f2614e2c92705d6a6824a380'\G
*************************** 1. row ***************************
          JOB_ID: 1761643165987
           LABEL: test_load_job_label_b5347e94f2614e2c92705d6a6824a380
           STATE: FINISHED
        PROGRESS: Unknown id: 1761643165987
            TYPE: INSERT
        ETL_INFO: \N
       TASK_INFO: cluster:N/A; timeout(s):14400; max_filter_ratio:0.0
       ERROR_MSG: \N
     CREATE_TIME: 2025-10-28 17:23:08
  ETL_START_TIME: 2025-10-28 17:23:08
 ETL_FINISH_TIME: 2025-10-28 17:23:08
 LOAD_START_TIME: 2025-10-28 17:23:08
LOAD_FINISH_TIME: 2025-10-28 17:23:09
             URL:
     JOB_DETAILS: {"ScannedRows":1,"LoadBytes":25,"FileNumber":0,"FileSize":0,"TaskNumber":1,"Unfinished backends":[],"All backends":[1754377661179]}
  TRANSACTION_ID: 72076
   ERROR_TABLETS: {}
            USER: root
         COMMENT:
 FIRST_ERROR_MSG:

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

Release note

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Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
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    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

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• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[sollhui]

run buildall

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