全局事务结束逻辑优化

- [ ] I have searched the [issues](https://github.com/seata/seata/issues) of this repository and believe that this is not a duplicate.

### Ⅰ. Issue Description
1、PR #4233 在处理lock数据残留时，将方法io.seata.server.session.GlobalSession#clean 判断是否有AT branch的逻辑移到外层，这会导致 TCC 全局事务在二阶段会执行clean资源清除动作（实际上TCC没有lock资源）；
2、目前的全局事务end方法与各个模式是紧密耦合在一起的，导致逻辑复杂不易扩展，需要考虑将end方法抽象出来，每个模式具备自己的end逻辑；
3、其它优化：io.seata.server.coordinator.DefaultCore#doGlobalCommit 方法理论上只有 TCC 才会走到二阶段提交失败并且不可重复（PhaseTwo_CommitFailed_Unretryable）逻辑，不需要再判断是否可异步提交（canBeCommittedAsync）。

### Ⅱ. Describe what happened

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

```
Just paste your stack trace here!
```

### Ⅲ. Describe what you expected to happen

### Ⅳ. How to reproduce it (as minimally and precisely as possible)

1. xxx
2. xxx
3. xxx

### Ⅴ. Anything else we need to know?

### Ⅵ. Environment:

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