Fix split_file when overlap = 0, add test

[k-boikov]

Background

split_file would eat 1 symbol when overlap = 0 because of end + (-1)

Changes

use max(offset, 0) to ensure we never subtract from "end"

Test Plan

Added test for overlap = 0

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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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 🎉

Comparison is base (57ea7b5) 63.79% compared to head (4e8c710) 63.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3599      +/-   ##
==========================================
+ Coverage   63.79%   63.82%   +0.02%     
==========================================
  Files          74       74              
  Lines        3447     3447              
  Branches      507      507              
==========================================
+ Hits         2199     2200       +1     
  Misses       1079     1079              
+ Partials      169      168       -1     

Impacted Files	Coverage Δ
autogpt/commands/file_operations.py	83.72% <100.00%> (+0.58%)	⬆️

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[github-actions]

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[github-actions]

Conflicts have been resolved! 🎉 A maintainer will review the pull request shortly.

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