Remove pipeline trigger subcommand from the autocomplete

[spirosoik]

Summary

Trigger was a leftover command from the pipelines run implementation.

Ticket Link

Ticket: #332

[codecov]

Codecov Report

Base: 28.89% // Head: 28.92% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (987b5b5) compared to base (4cab993).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #334      +/-   ##
==========================================
+ Coverage   28.89%   28.92%   +0.03%     
==========================================
  Files          21       21              
  Lines        2724     2721       -3     
==========================================
  Hits          787      787              
+ Misses       1851     1848       -3     
  Partials       86       86              

Impacted Files	Coverage Δ
server/command.go	23.72% <ø> (+0.14%)	⬆️

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