Refactor: Move augmented_sys_path into tests directory

[akamat10]

Type of Changes

	Type
✓	🔨 Refactoring

Description

• Addresses PR comment to move augmented_sys_path to tests directory

Refs #2589

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.24%. Comparing base (0954cd4) to head (5fb46fd).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2610      +/-   ##
==========================================
- Coverage   93.25%   93.24%   -0.02%     
==========================================
  Files          93       93              
  Lines       11068    11049      -19     
==========================================
- Hits        10322    10303      -19     
  Misses        746      746              

Flag	Coverage Δ
linux	93.13% <ø> (-0.02%)	⬇️
pypy	93.24% <ø> (-0.02%)	⬇️
windows	93.23% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
astroid/util.py	88.31% <ø> (-2.32%)	⬇️

[Pierre-Sassoulas]

Thank you for the cleanup !

[DanielNoord]

Thanks @akamat10!