OCM. search for federated users doesn't contain ocis instance info

[ScharfViktor]

related:
#9788
#9702
#9735

Steps:

Given using server "LOCAL"
And "Alice" has created the federation share invitation
And using server "REMOTE"
And "Brian" has accepted invitation
When user "Brian" searches for federated user "ali" using Graph API

Actual: response doesn't contain info about ocis instance (no identities section).

Expected: response contains identities section to understand which ocis instance this user is from.

"identities": [
                {
                    "issuer": "federation-ocis-server",
                    "issuerAssignedId": "b49ed57c-c562-4740-a5be-4ebc8b947100"
                }
            ]

This can be useful if we will be sharing more than 2 ocis instances to separate users (this can be in case of same names)

CC @rhafer @tbsbdr

[phil-davis]

Yes, there will need to be some way to present a UI so that a user can distinguish which federated instance each user comes from. The API response probably needs to have a federated domain name (or something similar), and then someone needs to think about how best to present something in client UIs that will be user-friendly.