fix: duplicate usage output

[phm07]

When a *pflag.FlagSet is parsed, it outputs a usage string if the --help flag is included. Since Cobra already does this, this behavior needs to be disabled or the usage will be printed twice.

---

Since #736 hasn't been release yet, this fix shouldn't appear in the changelog.

BEGIN_COMMIT_OVERRIDE
chore: fix duplicate usage output
END_COMMIT_OVERRIDE

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 59.68%. Comparing base (f69d261) to head (7b63f38).
Report is 1 commits behind head on main.

Files	Patch %	Lines
internal/state/config/config.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #786      +/-   ##
==========================================
- Coverage   59.74%   59.68%   -0.07%     
==========================================
  Files         209      210       +1     
  Lines        7634     7639       +5     
==========================================
- Hits         4561     4559       -2     
- Misses       2432     2437       +5     
- Partials      641      643       +2     

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