Description

Validate the brick name when running poly create component and poly create base. If a brick with the same name already exists, exit with a fail code.

Motivation and Context

fixes #430

How Has This Been Tested?

✅ CI
✅ Local run of the create base and create component commands using the CLI
✅ Local run of the create base and create component commands using the Poetry plugin

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 not work as expected)

Checklist:

• I have read the code of conduct.
• I have read the contributing guide.
• I have updated the documentation accordingly (if applicable).