feat: design activation changes

[jacobrkerstetter]

Description

• Removed temporary design in insert_file to avoid multiple designs being active at once
• Activated tests to verify design is active

Issue linked

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate unit tests.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have added the minimum version decorator to any new backend method implemented.
• I have made sure that the title of my PR follows Conventional commits style (e.g. feat: extrude circle to cylinder)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.03%. Comparing base (695b425) to head (4a0b39c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1707   +/-   ##
=======================================
  Coverage   91.02%   91.03%           
=======================================
  Files          91       91           
  Lines        8004     7995    -9     
=======================================
- Hits         7286     7278    -8     
+ Misses        718      717    -1     

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[RobPasMue]

LGTM! Thanks @jacobrkerstetter !