[MM-42918] Add debug information for setup wizard

[hanzei]

Summary

Downstream of mattermost/mattermost-plugin-github#679

Ticket Link

https://mattermost.atlassian.net/browse/MM-42918

[codecov]

Codecov Report

Patch coverage: 59.09% and project coverage change: +0.17 🎉

Comparison is base (0e8c416) 31.03% compared to head (157766b) 31.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #379      +/-   ##
==========================================
+ Coverage   31.03%   31.20%   +0.17%     
==========================================
  Files          21       21              
  Lines        3757     3778      +21     
==========================================
+ Hits         1166     1179      +13     
- Misses       2471     2479       +8     
  Partials      120      120              

Impacted Files	Coverage Δ
server/flow.go	0.00% <0.00%> (ø)
server/plugin.go	15.07% <0.00%> (-0.15%)	⬇️
server/utils.go	70.87% <100.00%> (+4.20%)	⬆️

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