fix: Azure input artifact support optional. Fixes #11179

[liangyuanpeng]

Fixes #11179

Motivation

Modifications

Return argoerrors.CodeNotFound when the artifact is not a directory and the file doesn't exist

Verification

Create a workflow to download azure artifact and the blob is not exist.

When optional is true, workflow is green.

test-azure-artifact.yaml

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: s3-azure-artifact-
spec:
  entrypoint: main
  templates:
  - dag:
      tasks:
      - name: generate
        template: generate
      - depends: generate
        name: consume
        template: consume
    name: main
  - container:
      args:
      - ls
      command:
      - bash
      - -c
      image: argoproj/argosay:v2
    name: generate
  - container:
      args:
      - ls /tmp
      command:
      - bash
      - -c
      image: argoproj/argosay:v2
    inputs:
      artifacts:
      - archive:
          none: {}
        azure:
          blob: file2.txt
          accountKeySecret:
            name: azure-storage-credentials
            key: account-access-key
          container: argo
          endpoint: https://{yourself}.blob.core.windows.net
        name: file
        optional: true
        path: /tmp/file.txt
    name: consume