Improvement request: avoid using API tojson and tojenkinsfile

[LinuxSuRen]

As you can see, the Pipeline editing feature requires the following two APIs:

• v1alpha2/tojenkinsfile
• v1alpha2/tojson

Those APIs will call Jenkins API as well. It will be unstable due to there is no HA solution for Jenkins.

Possible solution

Considering those APIs want to convert data format between JSON and Jenkinsfile. We could do it in the backend, for example, store the data in annotations, and convert it in the controller.

• [ ] #714

/kind feature

[LinuxSuRen]

/assign

[LinuxSuRen]

v1alpha2/tojenkinsfile and v1alpha2/tojson was removed in https://github.com/kubesphere/ks-devops/pull/795