assign value to component_name in preset stack registration

Describe changes

Fixed UnboundLocalError: cannot access local variable 'component_name' where it is not associated with a value when running zenml stack register with preset components.

e.g.

# SETUP
zenml service-connector register my-service-connector \
  --type aws \
  --auth-method implicit \
  --auto-configure
zenml orchestrator register my-orchestrator \
  --flavor vm_aws \
  --connector my-service-connector
zenml artifact-store register my-artifact-store \
  --flavor s3 \
  --path "s3://my-store/zenml" \
  --connector my-service-connector
zenml container-registry register my-container-registry \
  --flavor aws \
  --uri "1234567890.dkr.ecr.us-east-1.amazonaws.com" \
  --connector my-service-connector

# THROWS UnboundLocalError
zenml stack register my-stack \
  --connector my-service-connector \
  --orchestrator my-orchestrator \
  --artifact-store my-artifact-store \
  --container_registry my-container-registry \
  --set

Pre-requisites

Please ensure you have done the following:

[Y] I have read the CONTRIBUTING.md document.
[N/A] If my change requires a change to docs, I have updated the documentation accordingly.
[N/A] I have added tests to cover my changes.
[Y] I have based my new branch on develop and the open PR is targeting develop. If your branch wasn't based on develop read Contribution guide on rebasing branch to develop.
[N/A] If my changes require changes to the dashboard, these changes are communicated/requested.

Types of changes

[X] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)
[ ] Other (add details above)

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zenml-io / zenml