Add possibility to use AWS EC2 generator instead of Marketplace generator

[esebesto]

https://issues.redhat.com/browse/COST-5100

• adding ability to retrieve "lineitem_lineitemdescription", "product_name" and "billing_entity" from EC2Genertor in yaml file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.7%. Comparing base (75f3128) to head (963faf4).

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #509     +/-   ##
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- Coverage   93.8%   93.7%   -0.0%     
=======================================
  Files         62      62             
  Lines       4677    4684      +7     
  Branches     658     659      +1     
=======================================
+ Hits        4385    4391      +6     
  Misses       153     153             
- Partials     139     140      +1