*(cdc): accept access denied error when query tidb_version (#11129)

[ti-chi-bot]

This is an automated cherry-pick of #11129

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]

/test verify

[lidezhu]

/test pull-cdc-integration-storage-test

[ti-chi-bot]

@lidezhu: The specified target(s) for /test were not found.
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• /test cdc-integration-kafka-test
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• /test cdc-integration-storage-test
• /test dm-compatibility-test
• /test dm-integration-test
• /test engine-integration-test
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/test pull-cdc-integration-storage-test

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[lidezhu]

/test cdc-integration-storage-test

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hicqu, lidezhu

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