feat: avoid getting image metadata from container registry when it is not needed

[rangoo94]

Pull request description

• When there is information about working directory, user group and command/shell provided for each of the steps, avoid calling the Container Registry for additional metadata.
  • additionally image.command, image.args and image.workingDir variables should not be used

Example Test Workflow

kind: TestWorkflow
apiVersion: testworkflows.testkube.io/v1
metadata:
  name: workflow-without-inspecting-images
spec:
  container:
    workingDir: /data
    securityContext:
      runAsGroup: 1000
  job:
    activeDeadlineSeconds: 60
  steps:
  - run:
      image: busybox
      shell: pwd && tree /data
  - run:
      image: busybox
      command:
      - /bin/sh
      - -c
      args:
      - echo 'hello'
  - run:
      image: busybox
      command:
      - /bin/sh
      - -c
      - echo 'hello again'
  - run:
      image: blah-unknown-image:1234
      shell: echo not executed because of unknown image

Checklist (choose whats happened)

• breaking change! (describe)
• tested locally
• tested on cluster
• added new dependencies
• updated the docs
• added a test

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