Simplify auth header check

[jesusbv]

Description

Move auth check to outer method
from SccProxy.get_scc_activations -> SccProxy.scc_check_subscription_expiration

SccProxy.get_scc_activations method now accepts auth and not the full headers object

• Related Issue / Ticket / Trello card:

How to test

All operations should remain the same and keep the same behaviour

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• Bug Fix (a non-breaking change which fixes an issue)
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