eventservice: turn off scan window cap and refresh resolvedTs

[asddongmen]

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[gemini-code-assist]

Code Review

This pull request introduces temporary debug changes that disable core functionality in the event service. Specifically, the scan window capping logic in event_broker.go has been hardcoded to zero, and the refreshMinSentResolvedTs function in scan_window.go has been short-circuited with an early return. Feedback indicates that these changes must be reverted to restore proper flow control and progress tracking before merging.

[gemini-code-assist]

The scan window capping logic has been disabled by hardcoding scanMaxTs to 0. The accompanying comment indicates this is for testing purposes. This should be reverted to use task.changefeedStat.getScanMaxTs() to ensure proper flow control and prevent potential memory issues in production.

Suggested change

	//scanMaxTs := task.changefeedStat.getScanMaxTs()
	// fizz for test
	scanMaxTs := uint64(0)
	scanMaxTs := task.changefeedStat.getScanMaxTs()

[gemini-code-assist]

The refreshMinSentResolvedTs function is short-circuited with an early return. This prevents the changefeed from correctly calculating the minimum resolved timestamp across dispatchers, which is a core part of the event service's progress tracking. This debug code should be removed.

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