refactor: update ExtractValidation type to use 'unknown'

[ahmed-n-abdeltwab]

description:

Change the ExtractValidation type to return 'unknown' instead of 'never' for the case where the params return never'. Instead of never, unknown should be good.

Tests:

[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is targeting the wrong base branch. It should target 7.9.0, but it targets 7.8.0

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Latest commit: 1abd4cd

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[ahmed-n-abdeltwab]

This is also an issue with POST; perhaps changes could also be made to POST, PUT, etc.