http: set destination service name in the outbound

[jronak]

Set the destination service name in the HTTP outbound. This will be used in the follow-up PR for emitting TLS connection metrics tag value.

[codecov[bot]]

Codecov Report

Base: 85.26% // Head: 85.27% // Increases project coverage by +0.01% :tada:

Coverage data is based on head (94e933a) compared to base (de8976f). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2174      +/-   ##
==========================================
+ Coverage   85.26%   85.27%   +0.01%     
==========================================
  Files         269      269              
  Lines       15348    15352       +4     
==========================================
+ Hits        13086    13091       +5     
  Misses       1843     1843              
+ Partials      419      418       -1     

Impacted Files	Coverage Δ
transport/http/config.go	94.80% <100.00%> (+0.06%)	:arrow_up:
transport/http/outbound.go	92.06% <100.00%> (+0.08%)	:arrow_up:
dispatcher_startup.go	91.07% <0.00%> (-1.79%)	:arrow_down:
internal/observability/graph.go	93.75% <0.00%> (+0.62%)	:arrow_up:
transport/tchannel/peer.go	97.36% <0.00%> (+1.31%)	:arrow_up:

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