[SL-3345] [Feature] Update mf tutorial flow to always create / use the sample dbt project

[plypaul]

Is this your first time submitting a feature request?

• I have read the expectations for open source contributors
• I have searched the existing issues, and I could not find an existing issue for this feature
• I am requesting a straightforward extension of existing metricflow functionality, rather than a Big Idea better suited to a discussion

Describe the feature

To simplify the user experience, the tutorial should always create a sample project and ask the user to run the tutorial commands from there.

Describe alternatives you've considered

No response

Who will this benefit?

New users.

Are you interested in contributing this feature?

No response

Anything else?

No response

_SL-3345