Fix commands with same name overwriting

[k-boikov]

Background

Having a command with the same name overwrites the first one even if the second one is disabled.

Changes

Do not register a command if the command is disabled. Add warning if something is gonna overwrite a command.

Related to

#3904

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			May 15, 2023 6:36pm

[codecov]

Codecov Report

Patch coverage: 77.77% and project coverage change: +0.04 🎉

Comparison is base (16b7e7a) 60.72% compared to head (c329043) 60.76%.

❗ Current head c329043 differs from pull request most recent head 2294423. Consider uploading reports for the commit 2294423 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4226      +/-   ##
==========================================
+ Coverage   60.72%   60.76%   +0.04%     
==========================================
  Files          73       73              
  Lines        3320     3329       +9     
  Branches      475      479       +4     
==========================================
+ Hits         2016     2023       +7     
- Misses       1164     1165       +1     
- Partials      140      141       +1     

Impacted Files	Coverage Δ
autogpt/commands/command.py	77.92% <77.77%> (-0.02%)	⬇️

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[kinance]

Resolves #4210