[MAINT] Handle long-running tests on GHA #252
Description
Right now we have an integration test suite that checks every configuration of the BART / BCF APIs. For BCF there are over 3k configurations, so testing them all takes upwards of 30 minutes. In R we can set these tests to skip_on_ci() but we need a more flexible solution for both R and Python that allows us to run these tests on CI when desired.