Consider adding locally workflow with API requests ON

[maciekbanas]

Basically in #481 all responses have been mocked which makes tests and checks run faster, especially it is very convenient for PRs with GHA workflow. Still, there are used response fixtures all the way which makes big chunk of the workflow a bit artificial, as there is need sometimes to check/test the real situation.
The idea is then to prepare a local workflow which would switch on real API requests (at the beginning for example of GitHub get_commits tests), and propably switched off on GitHub and certainly on CRAN.