wip: allow for user to configure split filesystem feature gate

[kannon92]

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[openshift-ci]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kannon92
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[openshift-ci]

@kannon92: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-ovn-techpreview	6171638	link	true	/test e2e-aws-ovn-techpreview
ci/prow/e2e-aws-serial-techpreview	6171638	link	true	/test e2e-aws-serial-techpreview
ci/prow/e2e-aws-ovn-hypershift	6171638	link	true	/test e2e-aws-ovn-hypershift
ci/prow/e2e-azure	6171638	link	false	/test e2e-azure

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