Fix spec when there are extra projects left behind

What does this MR do and why?

This spec depends on the number of projects in the DB so we clear the projects before the test runs

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #378414 (closed)