binlog/event: improve parsing MariaDB status vars in binlog

[lance6716]

What problem does this PR solve?

a warning in log

What is changed and how it works?

support this new status vars from MariaDB

Check List

Tests

• Unit test

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch
• Need to be included in the release note

[GMHDBJD]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• GMHDBJD

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[lance6716]

/label require-LGT1

[ti-chi-bot]

@lance6716: The label(s) require-lgt1 cannot be applied. These labels are supported: Hacktoberfest, TiDB-5.0, already-cherry-pick-1.0, already-cherry-pick-2.0, already-update-dm-ansible, already-update-docs, already-update-release-note, dependencies, good first issue, help wanted, high-performance, hptc, javascript, needs-cherry-pick-1.0, needs-cherry-pick-2.0, needs-update-dm-ansible, needs-update-docs, needs-update-release-note, question, release-track.

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/label require-LGT1

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[ti-chi-bot]

@lance6716: The label(s) require-lgt1 cannot be applied. These labels are supported: Hacktoberfest, TiDB-5.0, already-cherry-pick-1.0, already-cherry-pick-2.0, already-update-dm-ansible, already-update-docs, already-update-release-note, dependencies, good first issue, help wanted, high-performance, hptc, javascript, needs-cherry-pick-1.0, needs-cherry-pick-2.0, needs-update-dm-ansible, needs-update-docs, needs-update-release-note, question, release-track.

In response to this:

/label require-LGT1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

@lance6716: The label(s) require-lgt1 cannot be applied. These labels are supported: Hacktoberfest, TiDB-5.0, already-cherry-pick-1.0, already-cherry-pick-2.0, already-update-dm-ansible, already-update-docs, already-update-release-note, dependencies, good first issue, help wanted, high-performance, hptc, javascript, needs-cherry-pick-1.0, needs-cherry-pick-2.0, needs-update-dm-ansible, needs-update-docs, needs-update-release-note, question, release-track.

In response to this:

/label require-LGT1

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[lance6716]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 521de96

[ti-srebot]

cherry pick to release-2.0 in PR #1563