The branch count number is not the latest after clicking the refresh button on the Pipeline list page

**General remarks**

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**Describe the bug**
The branch count number is not the latest after clicking the refresh button on the Pipeline list page.


/bug
/priority low
/area devops

**Versions used(KubeSphere/Kubernetes)**
KubeSphere: `nightly-20210314`

**Environment**
This is not an environmental issue.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to the DevOps Pipeline page
2. Create a multi-branch Pipeline
3. Scan the PIpeline, see the branch count number
4. Create some new branches in git repository
5. Check the branch count number again

**Expected behavior**
Expect to have a consistent branch count number on the same page.