refactor(extract): call path-to-posix less often

[sverweij]

Description

• Moves converting paths to posix earlier in the process and removes the conversion where the conversion doesn't have any effect anymore.

Motivation and Context

See #386 - @tvolodimir put me on this trail that path-to-posix has an impact on performance. On msdos derivatives this refactor tends to make a significant difference in performance - on an i5 with win10 dependency-cruiser cruises itself in ~27s instead of in 32s (which is still ~3x as slow as it's on unix derivatives, but it's a start).

How Has This Been Tested?

• automated non-regression tests + green ci

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Documentation only change
• Refactor (non-breaking change which fixes an issue without changing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• 📖

  • My change doesn't require a documentation update, or ...
  • it does and I have updated it

• ⚖️

  • The contribution will be subject to The MIT license, and I'm OK with that.
  • The contribution is my own original work.
  • I am ok with the stuff in CONTRIBUTING.md.

[codeclimate]

Code Climate has analyzed commit 4330d82 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (99% is the threshold).

This pull request will bring the total coverage in the repository to 99.9% (0.0% change).

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