Remove hardcoded org value for GithubOrg in acceptance tests

[josecordaz]

Short description
As a developer I want to be able to run acceptance tests localy so that I can easy debug functionality from the GithubAction task locally. That task already have an env var named GITHUB_ORG but it is not being used in the tests. The current value of GITHUB_ORG is hard-coded in the tests.

Acceptance criteria

• a developer should be able to define the Github organization used at the moment of running acceptance tests locally through the use of the env var named GITHUB_ORG.