pkg(dm): modify the type of pos returned by function GetMasterStatus (#7815)

[ti-chi-bot]

This is an automated cherry-pick of #7815

What problem does this PR solve?

Issue Number: close #7483

What is changed and how it works?

Returned pos of function GetMasterStatus should be uint64 instead of uint32

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]

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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.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

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[ti-chi-bot]

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

Test name	Commit	Details	Required	Rerun command
pull-dm-compatibility-test	b5c483e	link	true	/test dm-compatibility-test
jenkins-ticdc/verify	b5c483e	link	true	/test verify
pull-dm-integration-test	b5c483e	link	true	/test dm-integration-test

Full PR test history. Your PR dashboard.

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[ti-chi-bot]

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

Test name	Commit	Details	Required	Rerun command
pull-dm-integration-test	b5c483e	link	true	/test dm-integration-test
jenkins-ticdc/verify	b5c483e	link	true	/test verify

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.