feat: Add options of prune propagation policy in cd modal

Created by: harrisonliu5

What type of PR is this?

/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #https://github.com/kubesphere/ks-devops/issues/617

Special notes for reviewers:

Does this PR introduced a user-facing change?

None

Additional documentation, usage docs, etc.: