syncer: check block-allow list before online DDL components (#1775)

[ti-chi-bot]

This is an automated cherry-pick of #1775

What problem does this PR solve?

close #1776

What is changed and how it works?

move block-allow list check and binlog filter check before online DDL components

Check List

Tests

• Integration test

Code changes

• Has interface methods change

Side effects

Related changes

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

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• glorv
• lance6716

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[glorv]

/merge

[ti-chi-bot]

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

Commit hash: bd61068

[lance6716]

/run-all-tests