Add request to billing check

[jesusbv]

Description

The verification code will check the headers of @request object in order to access the content of SUMA headers to grant access

Currently @request is nil coming from this code flow

This add the request to the call

• Related Issue / Ticket / Trello card:

How to test

Accessing @request object inside the provider verification code wihtin the instance-flavor-check code path should not crash

Change Type

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• Bug Fix (a non-breaking change which fixes an issue)
• New Feature (a non-breaking change which adds new functionality)
• Documentation Update (a change which only updates documentation)

Checklist

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• I have reviewed my own code and believe that it's ready for an external review.
• I have provided comments for any hard-to-understand code.
• I have documented the MANUAL.md file with any changes to the user experience.
• If my changes are non-trivial, I have added a changelog entry to notify users at package/obs/rmt-server.changes.

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