fix: kq sync producer write message wait 1s issue

[MarkJoyMa]

Greptile Summary

This change addresses an issue with synchronous message pushing in the Kafka pusher, eliminating a 1-second delay problem.

• Modified kq/pusher.go to set BatchSize to 1 when syncPush is true, ensuring immediate message sending without batching
• Improves responsiveness for synchronous push operations in Kafka messaging
• Resolves potential performance bottleneck for time-sensitive applications using synchronous push

[greptile-apps]

LGTM

_{1 file(s) reviewed, no comment(s)
Edit PR Review Bot Settings}