Assign cards to teams/groups that the board is indirectly shared with

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Is your feature request related to a problem? Please describe.

• Situation:
  You have a "Subteam" that is a member of a "Team".

• Access:
  You share a board with Team -> Subteam (and all of its members) get the same access to the board as well.

• Assignment of cards:
  You can assign a card to Team, all single users inside Team, but not groups or teams inside of Team (e.g. Subteam).

Describe the solution you'd like
Assignment should be possible for teams and groups inside of teams that a board is shared with.

Describe alternatives you've considered
Alternatively, all the subteams have to be added as single shares to the board. That is not very practical.

No files or tests are named in the issue. Start by locating the board-sharing and card-assignment entry points, then verify that a nested team or group can be assigned when its parent team shares the board, without requiring separate shares.