information-schema-deadlocks: add the "Begin" step

[qiancai]

What is changed, added or deleted? (Required)

Add the "Begin" step to the transaction

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• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

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[ti-chi-bot]

@MyonKeminta: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #20413.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #20414.