new_owner: refine processor (#1821)

[ti-chi-bot]

This is an automated cherry-pick of #1821

What problem does this PR solve?

• using reactor state in model package but not in processor package (uniform with new owner)
• context.Contextshould be import by context and the cdc/pkg/context.Context shoule be import by cdcContext
• remove reactor state in processor package

Check List

Tests

• Unit test
• Integration 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 #2123