fix: assign container computation errors to the 1st step requiring it

[rangoo94]

Pull request description

• Errors for container data (i.e. setting some environment variable to {{ unknownFunc }}) are now not displayed in the step
  • This change is pushing the error information down to the first step after

kind: TestWorkflow
apiVersion: testworkflows.testkube.io/v1
metadata:
  name: example
spec:
  steps:
  - container:
      env:
      - name: XYZ
        value: '{{ unknownFunc }}'
    shell: echo hello

Checklist (choose whats happened)

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