[Pipeline Improvement] Multi-branch pipeline & SCM pipeline

### What is version of KubeSphere DevOps has the issue?

v3.3.1

### How did you install the Kubernetes? Or what is the Kubernetes distribution?

kubekey

### Describe this feature

- [ ] https://github.com/kubesphere/ks-devops/issues/843
- [ ] https://github.com/kubesphere/ks-devops/issues/774

mentioned in https://kubesphere.com.cn/forum/d/9011-kubesphere-v331jenkinsfile
If need to create multi-branch pipeline, should select git repo
If need to create normal pipeline, should not select git repo
Jenkinsfile in SCM is not supported

### Additional information

_No response_

Start by reading linked issues 843 and 774, then review the referenced forum discussion about the Jenkinsfile behavior. Confirm the expected distinction between multi-branch and normal pipelines and the requested SCM Jenkinsfile support; the work is done when those requirements are explicitly supported and verified.

Written by the indexing model from the issue text.