[Optimization] Improve Zookeeper startup wait logic in StartZookeeperWindowsProcessor

[Senrian]

What this PR does

Replace the hardcoded TimeUnit.SECONDS.sleep(3) with a Curator-based health check to wait for Zookeeper startup.

Why this is better

• No more flaky tests: Uses blockUntilConnected() with 3s timeout instead of fixed 3s sleep
• Faster on fast machines: If Zookeeper starts in 500ms, we proceed immediately
• Proper error handling: Throws DubboTestException on failure instead of silently ignoring exceptions
• Consistent with ResetZookeeperProcessor: Uses the same Curator pattern as the Unix version

Related Issue

Fixes #16085

Checklist

• Make sure there is a Dubbo issue that relates to this PR
• This PR is based on the 3.3 branch
• I have read the Contribution Guidelines
• I have ensure that all tests pass (mvn test)
• I have signed the Apache DCLA