Extract the external curve loop query to its own method

[vietle-bh]

NOTE: Depends on

Issues addressed by this PR

Closes #1496

Extracted the external curve loop query to its own method

Test files

I simply cut & pasted the relevant code to a new file, so hopefully just code review will be enough!

Changelog

Additional comments

[vietle-bh]

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[pawelbaran]

Changes make sense, happy to approve the refactor 👍

[pawelbaran]

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