Local backend: setup clone step respects context

[6543]

well before even if pipeline was canceld while clone step was prepaired, we still would have to wait for the clone plugin binary to be done downloading ...

now we respect context cancel and stop web requests e.g. download

[codecov]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 21.97%. Comparing base (4edfefe) to head (2d34681).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pipeline/backend/local/clone.go	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6030      +/-   ##
==========================================
- Coverage   21.99%   21.97%   -0.02%     
==========================================
  Files         432      432              
  Lines       39200    39204       +4     
==========================================
- Hits         8621     8616       -5     
- Misses      29771    29780       +9     
  Partials      808      808              

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