Enable net/http/pprof handlers in pprof web UI.

[aalexand]

This is so that pprof itself can be profiled when needed.

Tested: started the web UI, collected /debug/pprof/heap and /debug/pprof/profile profiles.

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 66.86%. Comparing base (c28834a) to head (f0b2654).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #943      +/-   ##
==========================================
- Coverage   66.89%   66.86%   -0.03%     
==========================================
  Files          44       44              
  Lines        9849     9852       +3     
==========================================
  Hits         6588     6588              
- Misses       2822     2825       +3     
  Partials      439      439              

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