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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #509 +/- ## ======================================= - 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 ```