feat: Refactor the pipeline template modal

Created by: harrisonliu5

Signed-off-by: harrisonliu5 harrisonliu@kubesphere.io

What type of PR is this?

/kind feature /kind api-change

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #https://github.com/kubesphere/console/issues/2946

Special notes for reviewers:

Does this PR introduced a user-facing change?

feat: Add pipeline template API

Additional documentation, usage docs, etc.:

/cc @kubesphere/sig-devops