Rpmlint Results tab doesn't work with multibuild packages

[antlarr-suse]

Issue Description

On multibuild packages, the "Rpmlint Results" tab doesn't show the rpmlint results for the right repository/architecture combinations.

Expected Result

On multibuild packages, the "rpmlint result" tab should show three comboboxes with flavor, repository, architecture and then the Rpmlint output from the selected combination. As an alternative, maybe it's even easier to implement a single combo box with all available combinations (since sometimes, not all combinations of flavor/repository/architecture are available since builds can be disabled/excluded).

How to Reproduce

1. Go to https://build.opensuse.org/package/show/openSUSE:Factory/lua-lua-mpris
2. Click on 'Rpmlint Results'
3. There should be a way to see the results for all succeeded builds. That is:

lua-lua-mpris:lua51 / standard / x86_64
lua-lua-mpris:lua51 / standard / i586
lua-lua-mpris:lua53 / standard / x86_64
lua-lua-mpris:lua53 / standard / i586

Instead, the repository options are "ports", "snapshot" and "totest", which make no sense for that package.