[Bug] the method of `log` in Entrance can be lost log info

### Search before asking

- [X] I searched the [issues](https://github.com/apache/incubator-linkis/issues) and found no similar issues.

### Linkis Component

linkis-computation-governance

### Steps to reproduce

If the script is executed for more than 5 minutes, and the log is actively added, the previous log will be lost.

### Expected behavior

Call the `log` method, we can get the log normally

### Your environment

- Linkis version used: 1.1.1

### Anything else

More than 5 minutes, the `cachedLogs` will write to hdfs . And execute `fakeClear` method that it set all element to null, but not reset the Attributes of `flag`, `tail`, `realSize`, so when realLog, it still read log from `cachedLogs`, but it empty.
(默认超过5分钟，增加新日志会执行清除缓存并刷hdfs，但是清除缓存不会重置cachedLogs的`flag`, `tail`, `realSize`，所以当获取日志时，!sharedCache.cachedLogs.nonEmpty 不会为空，也就是不会从hdfs读取，还是从内存读取)



### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!