cdclog: fix the lost ddl files (#1094)

[ti-chi-bot]

This is an automated cherry-pick of #1094

What problem does this PR solve?

Solve #870

What is changed and how it works?

ddl file use the first event's ts to build filename.
so the filter should be changed to the first event's ts < endTS

Check List

Tests

• Unit test

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Note

• Fix the issue that cdclog lost some DDLs during restore.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• kennytm
• zwj-coder

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[3pointer]

/merge

[ti-chi-bot]

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

Commit hash: 5919807