new_owner: let processor and owner use the same reactor state (#1810)

[ti-chi-bot]

This is an automated cherry-pick of #1810

What problem does this PR solve?

a reactor state implement in model package, and I will remove the state implement in processor package in next pr.
the reactor state implements in model package and processor pacakge are roughly the same
it's order to let processor and owner use the same reactor state

FYI: what is recator state and how it works? see: https://github.com/pingcap/ticdc/blob/master/pkg/orchestrator/doc.go

Check List

Tests

• Unit test

Release note

• No release note

[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.

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[zier-one]

merged by #2081