chore: remove unused error sentinel

[katcipis]

[codecov[bot]]

Codecov Report

Base: 71.64% // Head: 71.64% // No change to project coverage :thumbsup:

Coverage data is based on head (9b97b49) compared to base (b757d76). Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #644   +/-   ##
=======================================
  Coverage   71.64%   71.64%           
=======================================
  Files          60       60           
  Lines       10923    10923           
=======================================
  Hits         7826     7826           
  Misses       2754     2754           
  Partials      343      343           

Flag	Coverage Δ
tests	71.64% <ø> (ø)

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Impacted Files	Coverage Δ
cmd/terramate/cli/cli.go	4.21% <ø> (ø)

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