proxy(autoprovision): Save the subject and issuer claims when creating a user

We now use the graph user's identities property to store the subject and issuer claims
when autoprovisioning a user. The attrbute is not really used anywhere yet, but will
allow us to detect renames and other changes in the future.

Closes: #8956
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f