delete step should be idempotent

[jessesuen]

Description

If I try to use delete against a file/dir that does not exist, I get the following error:

step execution failed: step 0 met error threshold of 1: failed to run step "delete": failed to delete "./out": lstat out: no such file or directory

Ideally, delete should succeed if the specified path already does not exist.

If we want, we could add a strict option in case there is a use case where the path is expected to be there, but don't have a strong opinion here.

Screenshots

Steps to Reproduce

apiVersion: kargo.akuity.io/v1alpha1
kind: PromotionTask
metadata:
  name: render-config
  namespace: kargo-rendered-branches
spec:
  steps:
  - uses: delete
    config:
      path: ./out

Version

Kargo v1.2.2