Add missing package manager `poetry`

What does this MR do and why?

Add missing package manager poetry

Add the poetry value to allow filtering components and correctly achieve license matching for this package manager on the dependency list.

Currently the dependency list is reporting unknown for the license of poetry components and this has been reported by some customers.

See https://gitlab.com/gitlab-com/sec-sub-department/section-sec-request-for-help/-/issues/110 (internal)

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