Check response status when calling MMN

[tomasmik]

• Close body
• Check response code

[codecov-commenter]

Codecov Report

Merging #4007 (359c948) into master (e3ee6bd) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4007      +/-   ##
==========================================
+ Coverage   43.35%   43.40%   +0.04%     
==========================================
  Files         331      331              
  Lines       17422    17422              
==========================================
+ Hits         7554     7562       +8     
+ Misses       9110     9103       -7     
+ Partials      758      757       -1     

Impacted Files	Coverage Δ
tequilapi/endpoints/sse_handler.go	69.11% <0.00%> (-2.21%)	⬇️
p2p/channel.go	74.20% <0.00%> (+0.70%)	⬆️
requests/dialer_swarm.go	77.09% <0.00%> (+3.81%)	⬆️
core/policy/oracle.go	91.89% <0.00%> (+5.40%)	⬆️

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