File support_pkg_rebuild of Package dashboard

<staginglist>
    <staging name="openSUSE:Leap:15.2:Staging:A">
        <rebuild>unneeded</rebuild>
        <supportpkg>kernel-obs-build,brp-check-suse</supportpkg>
    </staging>
    <staging name="openSUSE:Leap:15.2:Staging:B">
        <rebuild>unneeded</rebuild>
        <supportpkg />
    </staging>
    <staging name="openSUSE:Leap:15.2:Staging:C">
        <rebuild>unneeded</rebuild>
        <supportpkg />
    </staging>
    <staging name="openSUSE:Leap:15.2:Staging:D">
        <rebuild>unneeded</rebuild>
        <supportpkg />
    </staging>
    <staging name="openSUSE:Leap:15.2:Staging:E">
        <rebuild>unneeded</rebuild>
        <supportpkg />
    </staging>
    <staging name="openSUSE:Leap:15.2:Staging:F">
        <rebuild>unneeded</rebuild>
        <supportpkg />
    </staging>
</staginglist>