Rename filepath to dir

[joshqsumner]

Describe your changes
Renamed created columns for relpath from config.input_dir from filepath1:N to dir1:N in parallel.parsers.parse_filepath.

Type of update
This is a feature update.

Associated issues
None

Additional context
Also addresses a bug that I think I introduced with the metadata regex stuff as a deepsource fix somewhere along the way related to which pieces of the relpath are used, it was skipping the first one but I think a syntax change upstream made that the wrong thing to do. Might be evidence that it needs more specific tests.

For the reviewer
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[deepsource-io]

Here's the code health analysis summary for commits 33f8429..cedafb7. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success		View Check ↗
Test coverage	✅ Success		View Check ↗

Code Coverage Report

Metric	Aggregate	Python
Branch Coverage	100%	100%
Composite Coverage	100%	100%
Line Coverage	100%	100%
New Branch Coverage	100%	100%
New Composite Coverage	100%	100%
New Line Coverage	100%, ✅ Above Threshold	100%, ✅ Above Threshold

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