Make version filtering more intuitive on the list page

[data-sync-user]

Right now the version filtering checks the firefox_min_version field, but ideally it should use NimbusFeatureVersionManager.between_versions_q() (https://github.com/mozilla/experimenter/blob/3f351f8c948b71bd29bfdec7525478ca5e38521e/experimenter/experimenter/experiments/models.py#L2392 ) to filter experiments that may target versions implicitly.

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