Remove CyclicDependencyError on backEdge during the DFS process

[cbentejac]

Description

This removes a partial check on cyclic dependencies in the DFS process that was introduced in #2965 and that causes erroneous exceptions even in cases where no cyclic dependency is present.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 79.61%. Comparing base (83902d6) to head (91b6bf0).
⚠️ Report is 2 commits behind head on develop.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
meshroom/core/graph.py	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2977      +/-   ##
===========================================
- Coverage    79.67%   79.61%   -0.07%     
===========================================
  Files           64       64              
  Lines         8602     8595       -7     
===========================================
- Hits          6854     6843      -11     
- Misses        1748     1752       +4     

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

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.