Net Mechanic should ensure that SDK bands are branded "servicing" if in servicing.

If an sdk band is not in preview, the tooling should ensure that the band is 'servicing' and not 'preview'. This should happen on both the release-specific and the general servicing branches.

Start by locating Net Mechanic's SDK-band validation and compare its behavior on the release-specific and general servicing branches. Verify the handling of bands that are not in preview, and consider the issue complete when both branch types consistently brand servicing bands as "servicing" rather than "preview".

Written by the indexing model from the issue text.