Write an UT to verify removal of TIMEOUT_FILTER_START_TIME   attachement in 
case if exception occurs 
in 
dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/TimeoutFilter.java.

This task is an extension to add UT for PR 
https://github.com/apache/incubator-dubbo/pull/3174

- [ ] I have searched the 
[issues](https://github.com/apache/incubator-dubbo/issues) of this repository 
and believe that this is not a duplicate.
- [ ] I have checked the 
[FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this 
repository and believe that this is not a duplicate.

### Environment

* Dubbo version: xxx
* Operating System version: xxx
* Java version: xxx

### Steps to reproduce this issue

1. xxx
2. xxx
3. xxx

Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

What do you expected from the above steps?

### Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```


[ Full content available at: 
https://github.com/apache/incubator-dubbo/issues/3234 ]
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