Remove http.target attr from ServerRequest

[MrAlias]

Removed the http.target attribute from being added by the ServerRequest function in httpconv packages.

[codecov]

Codecov Report

Merging #3687 (598687f) into main (0446207) will not change coverage.
The diff coverage is 100.0%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #3687   +/-   ##
=====================================
  Coverage   79.7%   79.7%           
=====================================
  Files        171     171           
  Lines      12673   12673           
=====================================
  Hits       10105   10105           
  Misses      2355    2355           
  Partials     213     213           

Impacted Files	Coverage Δ
semconv/internal/v2/http.go	100.0% <100.0%> (ø)