Remove dependency on goprocess

[gammazero]

The dependency on goprocess is not needed by boxo, and removing it removes the need to support it in code dependent on boxo.

Closes #709

[codecov]

Codecov Report

Attention: Patch coverage is 71.22302% with 40 lines in your changes missing coverage. Please review.

Project coverage is 60.35%. Comparing base (98850cf) to head (19d1d6b).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
bootstrap/bootstrap.go	39.62%	31 Missing and 1 partial ⚠️
bitswap/server/server.go	85.71%	5 Missing and 1 partial ⚠️
bitswap/client/client.go	81.81%	2 Missing ⚠️

@@            Coverage Diff             @@
##             main     #710      +/-   ##
==========================================
- Coverage   60.38%   60.35%   -0.03%     
==========================================
  Files         243      243              
  Lines       31025    31021       -4     
==========================================
- Hits        18733    18724       -9     
- Misses      10625    10633       +8     
+ Partials     1667     1664       -3     

Files with missing lines	Coverage Δ
bitswap/bitswap.go	67.05% <100.00%> (-0.39%)	⬇️
bitswap/server/internal/decision/engine.go	91.48% <100.00%> (+0.04%)	⬆️
namesys/republisher/repub.go	61.26% <100.00%> (+2.60%)	⬆️
bitswap/client/client.go	87.93% <81.81%> (-0.14%)	⬇️
bitswap/server/server.go	61.53% <85.71%> (-3.24%)	⬇️
bootstrap/bootstrap.go	30.90% <39.62%> (-1.05%)	⬇️

... and 8 files with indirect coverage changes

[hsanjuan]

Super happy to see goprocess no more. I believe this is good, I hope I'm not missing something. We should pay attention to goroutine leakage when rolling out RCs in case something is not getting closed as before, but it should be fine.

[hsanjuan]

Lastest commit LGTM too