syncer(dm): fix corrupt latin1 data when replicating (#7027)

[ti-chi-bot]

This is an automated cherry-pick of #7027

Signed-off-by: lance6716 [email protected]

What problem does this PR solve?

Issue Number: close #7028

What is changed and how it works?

decode latin1 data to unicode at DM's scope

Check List

Tests

• Integration test

Questions

Will it cause performance regression or break compatibility?

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

Release note

Fix a bug that latin1 data may be corrupt when replicating

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
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[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
jenkins-ticdc/verify	2c36d09	link	true	/test verify

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[ti-chi-bot]

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