Consider tf_extra_params for installability test

[lbarcziova]

For running the default installability test, we are currently not taking tf_extra_params from the configuration into consideration at all. Related code: https://github.com/packit/packit-service/blob/bcaa61270b920964d279d9610f98b7a8824fa9c4/packit_service/worker/helpers/testing_farm.py#L616