Refactoring - Scripts bug fixes

[miroslavpojer]

• refactor send_graphql_query method as it is described in SPIKE - refactoring analysis of initial solution #4 (comment)

• Be careful on these things:

output_file_path = f"{output_directory}/{output_file_name}"

it makes your code less multiplatform - this can't run on Windows because of different path delimiters. Better is to use

os.path.join function

• Be careful about variable scopes. For example, in github_query_project_state.py, session = requests.Session() - the session is not passed to any function below that code, but it's used within function send_graphql_query directly.