[Rocketmq-Connect-Runtime] Accept too many rmq messages when Init data sync

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**BUG REPORT**

1. Please describe the issue you observed:

- What did you do (The steps to reproduce)?

- What did you expect to see?

- What did you see instead?

2. Please tell us about your environment:

3. Other information (e.g. detailed explanation, logs, related issues, suggestions how to fix, etc):

**FEATURE REQUEST**

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2. Provide any additional detail on your proposed use case for this feature.

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The issue body contains only the standard report template and names no files, tests, or entry points. Start by obtaining reproduction steps, expected and actual message counts during initialization, environment details, and relevant logs; done criteria cannot be established until those details define the intended sync behavior.

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