Add GH tests for all supported versions of Python and R

[savingoyal]

Metaflow currently supports Py>=3.4 (with limited support for Py2.7) and R>=3.8. The GH tests only test for Py3.7 and R4.1. We should ensure we test on the whole set of permutations.

[savingoyal]

@oavdeev FYI - for a similar setup for BuildKite.

[hamelsmu]

Trying this here

[hamelsmu]

I'm able to get tests to pass for

Python:

• 3.6 to 3.9 on ubuntu
• 3.7 to 3.9 on macos

R

• 4.0 and 4.1.1 on ubuntu and macos

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@savingoyal do we want all tests to pass before opening a PR? Some tests are breaking for example because of the presence of f-strings, should I submit a PR for the ranges that pass only and then worry about expanding it from there?

[tfurmston]

Looks like this one can be closed by https://github.com/Netflix/metaflow/pull/946?