GONRG-3815: Make osdu_api.ini optional

Yan Sushchynski [EPAM/GC]requested to merge
GONRG-3815_Client_urls into master

The goal of this MR is to make using osdu_api.ini file for osdu_api optional. Now, we are able to use Airflow variables for initializing different osdu_api clients. Also, this MR depends on osdu-ingestion-lib!25 (merged)

Edited by Yan Sushchynski [EPAM/GC]

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