TST / string dtype: add env variable to enable future_string and add test build #58459
+6
−1
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xref #54792
Taking a similar approach as we did for CoW: allow enabling the option with an env variable (also useful for testing locally), and add an extra build on CI with that option enabled.
Not all tests are passing yet, so will see how to mark this build as "allow failures", but I think it would already be useful to set up the infra so we can fix the tests piecewise in follow-ups.