[Bugfix] Fix bug in auto-import of stack after recipe deploy

[wjayesh]

Describe changes

• Fixed a bug that didn't let users import a stack using the --import option in stack recipes CLI.
• Updated all references to zenml stack import to reflect the new syntax.

Pre-requisites

Please ensure you have done the following:

• [ ] I have read the CONTRIBUTING.md document.
• [ ] If my change requires a change to docs, I have updated the documentation accordingly.
• [ ] If I have added an integration, I have updated the integrations table and the corresponding website section.
• [ ] I have added tests to cover my changes.

Types of changes

• [ ] 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)