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Convert PURL types to registry IDs when reading License DB export buckets

Oscar Tovar requested to merge add-purl_type-registry-mapping into master

What does this MR do and why?

Describe in detail what your merge request does and why.

This MR updates the GCP connector so that it reads from the license-db bucket using the registry id instead of the purl type. This is needed because PURL types and registry ids (used by the license-db export file structure) do not map 1:1. See the following table taken from Package metadata sync service reads from GCP bu... (#391749 - closed):

PURL type Registry ID Same?
conan conan ✅
gem rubygem ❌
golang go ❌
maven maven ✅
npm npm ✅
nuget nuget ✅
composer packagist ❌
pypi pypi ✅

Without this mapping, the connector will attempt to ready from a structure that does not exist.

# Does not exist ❌
gs://<bucket>/v1/gem/00001/00001.csv
# Does exist ✅
gs://<bucket>/v1/rubygem/00001/00001.csv

Relates to #391749 (closed)

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