infosync: correct the PD API call of GetLabelRules (#55189)

[ti-chi-bot]

This is an automated cherry-pick of #55189

What problem does this PR solve?

Issue Number: close #55188.

What changed and how does it work?

Correct the PD API call of GetLabelRules to GetRegionLabelRulesByIDs.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

SQL:

mysql> CREATE TABLE t (
    ->   a INT
    -> )
    -> PARTITION BY RANGE (a) (
    ->   PARTITION p0 VALUES LESS THAN (10)
    -> );
Query OK, 0 rows affected (0.04 sec)

mysql> ALTER TABLE t ATTRIBUTES 'merge_option=deny';
Query OK, 0 rows affected (0.03 sec)

mysql> ALTER TABLE t PARTITION p0 ATTRIBUTES 'merge_option=allow';
Query OK, 0 rows affected (0.03 sec)

mysql> ALTER TABLE t REMOVE PARTITIONING;
Query OK, 0 rows affected (0.20 sec)

mysql> SELECT * FROM information_schema.attributes WHERE attributes LIKE '%merge_option%';
Empty set (0.00 sec)

Before:

After:

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[JmPotato]

/retest-required

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-05 10:47:43.170645389 +0000 UTC m=+262593.037744478: ☑️ agreed by JmPotato.
• 2024-08-05 12:15:42.420504231 +0000 UTC m=+267872.287603320: ☑️ agreed by tangenta.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JmPotato, okJiang, tangenta

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

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Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #55197   +/-   ##
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  Coverage               ?   71.1733%           
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  Files                  ?       1466           
  Lines                  ?     422675           
  Branches               ?          0           
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  Hits                   ?     300832           
  Misses                 ?     101329           
  Partials               ?      20514           

Flag	Coverage Δ
unit	71.1733% <0.0000%> (?)

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Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.2982% <0.0000%> (?)