Feature: Extend Swagger Coverage for controller OAuth2SummitSponsorshipApiController (#428)

* feat: Extend Swagger Coverage for controller OAuth2SummitSponsorshipsApiController

* chore: remove unused code

* fix: incorrect required-groups and security scopes son getAllAddOns, getAddOnById and getMetadata methods

* fix: remove repeated schema

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Co-authored-by: Matias Perrone <github@matiasperrone.com>

Author: andrestejerina97