bitswap/httpnet: start pinging before signaling Connected

[hsanjuan]

Assuming that the stack might get a Connected notification, but we have not yet started pinging.

Attempting to send a message at that moment fails, the messagequeue shutdown as a result, but no disconnect/connect happens from that point as it expects.

Also add some logging to see if we are hitting those message sender exists.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 61.53%. Comparing base (2cf77c4) to head (29a80b6).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
bitswap/network/httpnet/httpnet.go	66.66%	2 Missing ⚠️

@@           Coverage Diff           @@
##             main     #982   +/-   ##
=======================================
  Coverage   61.52%   61.53%           
=======================================
  Files         254      254           
  Lines       31490    31491    +1     
=======================================
+ Hits        19375    19378    +3     
  Misses      10526    10526           
+ Partials     1589     1587    -2     

Files with missing lines	Coverage Δ
bitswap/network/httpnet/httpnet.go	64.60% <66.66%> (+0.27%)	⬆️

... and 7 files with indirect coverage changes

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