Stage agent label is reset while drawer is blur in pipeline graphic editor

Describe the bug

Stage agent label is reset while drawer is blur in pipeline graphical interface.

For UI issues please also add a screenshot that shows the issue.

Versions used(KubeSphere/Kubernetes) KubeSphere: Kubernetes: (If KubeSphere installer used, you can skip this)

Environment How many nodes and their hardware configuration:

1 master: 4c/8g 1 node: 4c/8g

To Reproduce Steps to reproduce the behavior:

1. Go to DevOps Project
2. Create a pipeline by default
3. Click Edit Pipeline
4. Select Custom Pipeline
5. Add a stage
6. Select stage agent type with node
7. Select stage agent label with maven
8. Click outside of drawer
9. Click the stage again
10. See the agent label value(reset by default)

Expected behavior

Do not reset my agent label when stage setting drawer is closed without confirming.