exp show: dvc experiment show slow due to the duplicated call on `scm.describe`

related to https://github.com/iterative/scmrepo/issues/144. 

![image](https://user-images.githubusercontent.com/6745454/196615215-43c3e0bd-9e73-48d8-8b5c-0831678d6f06.png)

# Bug Report



## Description



### Reproduce





### Expected



### Environment information



**Output of `dvc doctor`:**

```console
$ dvc doctor
```

**Additional Information (if any):**

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exp show: dvc experiment show slow due to the duplicated call on `scm.describe` #8451

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exp show: dvc experiment show slow due to the duplicated call on scm.describe #8451

Description

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Metadata

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exp show: dvc experiment show slow due to the duplicated call on `scm.describe` #8451