fix(socketServer): use clearTimeout instead of clearInterval

[thinkasany]

Summary

https://github.com/web-infra-dev/rsbuild/blob/main/packages/core/src/server/socketServer.ts#L79

    if (this.heartbeatTimer !== null) {
      this.heartbeatTimer = setTimeout(
        this.checkSockets,
        CHECK_SOCKETS_INTERVAL,
      ).unref();
    }

I see that heartbeatTimer is created by setTimeout, so should clearTimeout be used when recycling and clearing? I guess this may be left by using setInterval before.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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Pull Request Overview

This PR fixes an issue in the socket server where the heartbeat timer, created with setTimeout, was incorrectly cleared using clearInterval.

• Use clearTimeout to properly clear the timer.

[chenjiahan]

Nice catch 👍