Remove unused function split_file from file_operations.py

[Pwuts]

Background

split_file is not in use since #4208, see #3757 (comment)

Changes

• Remove split_file in file_operations.py
• Remove unit test for split_file

Test Plan

x

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	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 12, 2023 0:16am

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.19 ⚠️

Comparison is base (ff46c16) 70.15% compared to head (1e33476) 69.96%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4658      +/-   ##
==========================================
- Coverage   70.15%   69.96%   -0.19%     
==========================================
  Files          72       72              
  Lines        3598     3586      -12     
  Branches      572      569       -3     
==========================================
- Hits         2524     2509      -15     
- Misses        893      894       +1     
- Partials      181      183       +2     

Impacted Files	Coverage Δ
autogpt/commands/file_operations.py	82.79% <ø> (-1.05%)	⬇️

... and 1 file with indirect coverage changes

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[Auto-GPT-Bot]

You changed AutoGPT's behaviour. The cassettes have been updated and will be merged to the submodule when this Pull Request gets merged.