fix: Avoid the being deleting Pipelines on the list page

Created by: bunnymiao

Signed-off-by: Bunny qimiao@yunify.com

What type of PR is this?

/kind bug

What this PR does / why we need it:

Filter the being deleting Pipelines in the pipeline list

Which issue(s) this PR fixes:

Fixes #736

Special notes for reviewers:

Does this PR introduced a user-facing change?

NONE

Additional documentation, usage docs, etc.: