Refactor/move functions in app to agent

[collijk]

Background

We have some functions in autogpt.app that are literally only called by the Agent. I want the autogpt.app namespace for like actual application code.

Changes

• Moves the two functions that handle commands to the agent module
• Updates tests
• Removes an agent fixture that was just used test_agent.py and use the agent fixture defined in the main conftest.py

Documentation

X

Test Plan

CI

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.
• I have run the following commands against my code to ensure it passes our linters:

  black .
  isort .
  mypy
  autoflake --remove-all-unused-imports --recursive --ignore-init-module-imports --ignore-pass-after-docstring autogpt tests --in-place

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Name	Link
🔨 Latest commit	26343e8
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[codecov]

Codecov Report

Patch coverage: 39.39% and project coverage change: -0.01 ⚠️

Comparison is base (077e143) 51.01% compared to head (26343e8) 51.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4957      +/-   ##
==========================================
- Coverage   51.01%   51.00%   -0.01%     
==========================================
  Files         119      118       -1     
  Lines        4895     4884      -11     
  Branches      643      643              
==========================================
- Hits         2497     2491       -6     
+ Misses       2217     2212       -5     
  Partials      181      181              

Impacted Files	Coverage Δ
autogpt/main.py	23.68% <ø> (ø)
autogpt/agent/agent.py	54.11% <39.39%> (-3.86%)	⬇️

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[Pwuts]

Looks fine, aside from the merge conflict it's going to give me on #4799 :P