Allow assigning a Group to a dashboard's access list

[NicoMovh]

Hello,

With user Groups now in superset, it's still not possible to grant a group access to a dashboard. Dashboard access remains role-only.

For SSO deployments where team membership is expressed as groups (LDAP/OIDC), this means you can't share a dashboard with a group without a stand-in role per group which reintroduces exactly the per-role overhead that groups were meant to remove.

Could the group → dashboard binding be delivered mirroring the existing role mechanism? Adding a dashboard_groups association parallel to dashboard_roles with the DASHBOARD_RBAC flag.

This is really just the "Viewer" slice of the Subject model that was already designed in #28021 (SIP-126, now closed) and re-proposed in the #32116 (SIP-156, closed too) thread where a dashboard's access list would accept a User, Group, or Role, and DASHBOARD_RBAC roles would be migrated into Viewers. Rather than waiting on that full Subject/Viewer migration (now under [#28377](#28377, SIP-131), could just the Group-as-Viewer part land incrementally on top of the groups that already shipped?

This Discussion is asking specifically whether the dashboard-group case can be delivered on top of
the groups that is already available, rather than waiting on a full redesign.