*(cdc): accept access denied error when query tidb_version

[lidezhu]

What problem does this PR solve?

Issue Number: close #11128

What is changed and how it works?

When the downstream is a mysql cluster behind a workload balancer on the cloud, the workload balancer may provide an access point using domain name;
When cdc access the downstream using the domain name, the connection will use database information_schema automatically. In this case, when query select tidb_version(), the downstream will report error for non-root user like: Access denied for user xxx to database 'information_schema'.

Check List

Tests

• Unit test

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

None

[lidezhu]

/retest

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 57.6075%. Comparing base (61efa5f) to head (44e9837).
Report is 4 commits behind head on master.

Additional details and impacted files

Components	Coverage Δ
cdc	62.0433% <0.0000%> (+0.0736%)	⬆️
dm	51.2560% <ø> (+0.0524%)	⬆️
engine	63.4232% <ø> (+0.0282%)	⬆️

Flag	Coverage Δ
unit	57.6075% <0.0000%> (+0.0619%)	⬆️

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

@@               Coverage Diff                @@
##             master     #11129        +/-   ##
================================================
+ Coverage   57.5456%   57.6075%   +0.0619%     
================================================
  Files           854        854                
  Lines        126053     126124        +71     
================================================
+ Hits          72538      72657       +119     
+ Misses        48123      48077        -46     
+ Partials       5392       5390         -2     

[lidezhu]

/test dm-integration-test

[lidezhu]

/test dm-integration-test

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: asddongmen, hongyunyan

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Needs approval from an approver in each of these files:

• OWNERS [asddongmen,hongyunyan]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-20 02:16:14.627791897 +0000 UTC m=+2051528.384927469: ☑️ agreed by asddongmen.
• 2024-05-20 02:53:07.76994353 +0000 UTC m=+2053741.527079103: ☑️ agreed by hongyunyan.

[lidezhu]

/test dm-integration-test

[lidezhu]

/test dm-integration-test

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #11139.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #11140.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #11141.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #11142.