fix(bitswap/server): pass context to server engine to register metrics

[gammazero]

Fixes invalid metrics errors logged by kubo at daemon startup.

Fixes the problem from ipfs/kubo#10567 (review)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.40%. Comparing base (e38f236) to head (f9be5c8).
Report is 2 commits behind head on main.

@@            Coverage Diff             @@
##             main     #723      +/-   ##
==========================================
- Coverage   60.43%   60.40%   -0.04%     
==========================================
  Files         243      243              
  Lines       31056    31057       +1     
==========================================
- Hits        18770    18759      -11     
- Misses      10624    10633       +9     
- Partials     1662     1665       +3     

Files with missing lines	Coverage Δ
bitswap/server/internal/decision/engine.go	91.48% <100.00%> (ø)
bitswap/server/server.go	61.65% <100.00%> (-0.81%)	⬇️

... and 8 files with indirect coverage changes

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[lidel]

Thanks! I think this is good enough fix problem at hand (metrics regression due to goprocess cleanup that landed with #710).

In future we may want to rework the way bitswap metrics are gathered, but that would be a separate PR (while working on #722 i've identified few places where we do different things, eg. boxo/gateway only uses default registry and ignores duplicate registration errors)