infosync: correct the PD API call of GetLabelRules

[JmPotato]

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.2668%. Comparing base (f3e153a) to head (67e8475).
Report is 2 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55189        +/-   ##
================================================
+ Coverage   74.8430%   75.2668%   +0.4238%     
================================================
  Files          1568       1568                
  Lines        364503     439940     +75437     
================================================
+ Hits         272805     331129     +58324     
- Misses        71976      88237     +16261     
- Partials      19722      20574       +852     

Flag	Coverage Δ
integration	50.1442% <100.0000%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9567% <ø> (-2.2327%)	⬇️
parser	∅ <ø> (∅)
br	61.8698% <ø> (+14.1691%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rleungx, tangenta

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-05 10:07:13.478923473 +0000 UTC m=+260163.346022547: ☑️ agreed by rleungx.
• 2024-08-05 10:20:45.449517648 +0000 UTC m=+260975.316616736: ☑️ agreed by tangenta.

[JmPotato]

/cherry-pick release-8.1

[ti-chi-bot]

@JmPotato: new pull request created to branch release-8.1: #55197.

In response to this:

/cherry-pick release-8.1

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