`Build Environment` isn't set automatically in `Build a New Service from Source Code Repository`

Describe the bug Build Environment isn't set automatically in Build a New Service from Source Code Repository when I don't select it manually. However, It works after selecting manually.

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

Versions used(KubeSphere/Kubernetes) KubeSphere: 3.1.0

Environment How many nodes and their hardware configuration: 1 masters: 4cpu/8g 1 nodes: 4cpu/8g

To Reproduce Steps to reproduce the behavior:

1. Go to any Project page
2. Create a service
3. Choose any item under Build a New Service from Source Code Repository
4. Check builderImage value
5. Select Build Environment manually
6. Check builderImage value again

Expected behavior

builderImage should be set after initializing data.

/kind bug /priority high