fix: return rc=2 for unsupported commands

[michael-todorovic]

This PR returns rc=2 for unsupported commands.
Before, if you override the args for a component with a mistake, it happily returned 0. This can be misleading once in k8s, especially on the runner part which shown a Completed status whereas it totally crashed.

Now this returns a different rc and an error:

╰ go build -o bin/burrito main.go && bin/burrito server unsupportedcommand ; echo $?
Error: unknown server subcommand: unsupportedcommand
Run 'burrito server --help' for usagecmd to use burrito's server

Usage:
  burrito server [flags]
  burrito server [command]

Available Commands:
  start       Start burrito's server

Flags:
  -h, --help   help for server

Use "burrito server [command] --help" for more information about a command.
2

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 44.98%. Comparing base (235a7e0) to head (0f6d27c).

Files with missing lines	Patch %	Lines
internal/utils/cmd/cmd.go	0.00%	10 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #595      +/-   ##
==========================================
- Coverage   45.06%   44.98%   -0.08%     
==========================================
  Files          79       79              
  Lines        5743     5753      +10     
==========================================
  Hits         2588     2588              
- Misses       2940     2950      +10     
  Partials      215      215              

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