chore: move filesystem operations to new file

[samayer12]

Description

This PR moves a helper function to a dedicated file (filename open to discussion). This change was planned as part of #1402, we can bring it in here to reduce the amount of changes we consider at any given time.

Related Issue

Relates to #1397

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (security config, docs update, etc)

Checklist before merging

• Unit, Journey, E2E Tests, docs, adr added or updated as needed
• Contributor Guide Steps followed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.56%. Comparing base (adf7c37) to head (77c8b33).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1482   +/-   ##
=======================================
  Coverage   78.56%   78.56%           
=======================================
  Files          37       38    +1     
  Lines        1717     1717           
  Branches      410      410           
=======================================
  Hits         1349     1349           
  Misses        339      339           
  Partials       29       29           

Files with missing lines	Coverage Δ
src/lib/filesystemService.ts	100.00% <100.00%> (ø)
src/lib/helpers.ts	97.95% <ø> (-0.11%)	⬇️

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