ticdc: disable span replication in mysql/tidb changefeed

[overvenus]

What problem does this PR solve?

Issue Number: ref #7720

What is changed and how it works?

Force disable span replication on MySQ/TiDB changefeeds.

Check List

Tests

• Unit test

Questions

Will it cause performance regression or break compatibility?

No.

Do you need to update user documentation, design documentation or monitoring documentation?

No.

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• 3AceShowHand
• sdojjy

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[amyangfei]

Will MySQL sink support region based replication in the future?

[overvenus]

Will MySQL sink support region based replication in the future?

Yes, and it needs to solve "REPLACE INTO" issue first.

[overvenus]

/merge

[ti-chi-bot]

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

Commit hash: 3532608

[ti-chi-bot]

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/run-all-tests

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