🌱 Remove unused variable IRONIC_VMEDIA_SCHEME

[MahnoorAsghar]

This variable is not used anywhere in ironic-image, ironic and baremetal-operator

[MahnoorAsghar]

/test metal3-centos-e2e-integration-test-main /test metal3-ubuntu-e2e-integration-test-main

[elfosardo]

/approve

[metal3-io-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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[dtantsur]

Indeed

/lgtm