Vault identity policies not used when checking permissions

[jorgemarey]

Nomad version

Nomad v0.10.5

Issue

There's a problem when using nomad+vault having allow_unauthenticated to false if the token provided gets the policies from identity mappings.
Currently nomad is only using the policies array, but not using the identity_policies. This prevents users from being able to launch a job even when the token has the needed policies.

[github-actions]

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