identity/oidc: use inherited group membership for client assignments #14013
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Overview
This PR uses inherited group membership when evaluating client assignments during an OIDC flow.
Given the following group membership tree:
If Entity A authenticates through a client with an assignment that has Group A in its group_ids, the assignment membership check will be satisfied by group inheritance.
Fixes #14005
Testing
I added a test to this PR which sets up a similar scenario to the one explained above.