[Pipeline Improvement] Multi-branch pipeline & SCM pipeline

[chilianyi]

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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