fix(instrumentation): normalize paths for internal files in scoped packages

[pichlermarc]

Which problem is this PR solving?

See #4436. On Windows, internal files were not instrumented as this check was failing.

This happens, as require-in-the-middle returns the package name concatenated with a path seperator (/ or \ depending on platform).

On scoped packages, this turns out to be something like @opentelemetry/test-package\src\internal.js (note the mixed \ and /). To find the files to patch, this check is performed in the node-specific instrumentation base class. As the string for name in the module's files is then @opentelemetry\test-package\src\internal.js (note: all path seperators are \), this check fails, and all files are filtered out.

While it would be possible to normalize the name passed to InstrumentationBase._onRequire() from RequireInTheMiddleSingleton, this would also normalize main module names like @opentelemetry/test-package to @opentelemetry\test-package, which means that internal files will be instrumented, but the main module will not.

Therefore this PR adds normalization of the name used during filtering instead of directly in RequireInTheMiddleSingleton.

Fixes #4436
Fixes #4402
Related open-telemetry/opentelemetry-js-contrib#1925

Short description of the changes

• normalizes path returned by require-in-the-middle hook before checking the name against module file names

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Added tests
• Manual testing on Windows

[codecov]

Codecov Report

Merging #4467 (e42f184) into main (f86251d) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is n/a.

❗ Current head e42f184 differs from pull request most recent head 19338a4. Consider uploading reports for the commit 19338a4 to get more accurate results

Additional details and impacted files

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  Coverage   92.42%   92.42%           
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  Files         330      330           
  Lines        9520     9520           
  Branches     2031     2031           
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  Hits         8799     8799           
  Misses        721      721           

[trentm]

On scoped packages, this turns out to be something like @opentelemetry/test-package\src\internal.js (note the mixed \ and /).

Ew. RITM isn't being very nice here.