Fix dbt delete without project path

[jeremybeard]

Description

This change fixes a bug in astro dbt delete where if the project path is not specified then it does not correctly look at the current working directory for the dbt project.

🧪 Functional Testing

• Unit tests
• Manually tested

📋 Checklist

• Rebased from the main (or release if patching) branch (before testing)
• Ran make test before taking out of draft
• Ran make lint before taking out of draft
• Added/updated applicable tests
• Tested against Astro-API (if necessary).
• Tested against Houston-API and Astronomer (if necessary).
• Communicated to/tagged owners of respective clients potentially impacted by these changes.
• Updated any related documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.33%. Comparing base (a8e81d7) to head (d3322ab).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1678      +/-   ##
==========================================
+ Coverage   86.31%   86.33%   +0.01%     
==========================================
  Files         116      116              
  Lines       17052    17055       +3     
==========================================
+ Hits        14719    14724       +5     
+ Misses       1403     1402       -1     
+ Partials      930      929       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.