Revert "dm/test: swap upstream and downstream of sync_diff in some ca… (#4382)

[ti-chi-bot]

This is an automated cherry-pick of #4382

…ses (#3413)"

This reverts commit 35102b5.

What problem does this PR solve?

Issue Number: ref #4159

What is changed and how it works?

revert since pingcap/tidb-tools#583 is closed (may need to wait nightly build)

Check List

Tests

• No code

Release note

`None`.

[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.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

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[lance6716]

/cc @nongfushanquan @overvenus

[lance6716]

/merge

[ti-chi-bot]

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

Commit hash: e170a22

[lance6716]

/run-kafka-integration-test
/run-unit-test

[lance6716]

/run-kafka-integration-test