[BUG] webflux中SlotChainBuilder实例化异常后客户端被无限阻塞

[hulandianqing]

Issue Description

Type: bug report

Describe what happened

在spring-webflux中使用sentinel
请求过程中实例化SlotChainBuilder报错后DefaultErrorWebExceptionHandler无法正常处理异常并且不会输出任何日志，客户端请求被无限阻塞.
原因是SentinelReactorSubscriber的entryWhenSubscribed()方法只处理了BlockException异常

private void entryWhenSubscribed() {
        ContextConfig sentinelContextConfig = this.entryConfig.getContextConfig();
        if (sentinelContextConfig != null) {
            ContextUtil.enter(sentinelContextConfig.getContextName(), sentinelContextConfig.getOrigin());
        }

        try {
            AsyncEntry entry = SphU.asyncEntry(this.entryConfig.getResourceName(), this.entryConfig.getResourceType(), this.entryConfig.getEntryType(), this.entryConfig.getAcquireCount(), this.entryConfig.getArgs());
            this.currentEntry = entry;
            this.actual.onSubscribe(this);
        } catch (BlockException ex) {
            this.entryExited.set(true);
            this.cancel();
            this.actual.onSubscribe(this);
            this.actual.onError(ex);
        } finally {
            if (sentinelContextConfig != null) {
                ContextUtil.exit();
            }

        }

    }

Describe what you expected to happen

How to reproduce it (as minimally and precisely as possible)

1. 使用sentinel示例项目sentinel-webflux-example
2. 配置com.alibaba.csp.sentinel.slotchain.SlotChainBuilder的自定义实现

public class TestBuilder extends DefaultSlotChainBuilder {

    @Override
    public ProcessorSlotChain build() {
        ProcessorSlotChain chain = super.build();
        if(1==1){
            // 强制抛出异常
            throw new RuntimeException();
        }
        return chain;
    }
}

Tell us your environment

jdk21、spring-webflux:3.2.9

Anything else we need to know?

entryWhenSubscribed()方法中处理包括BlockException的所有异常，问题解决