Backport of client: fix role permission issue with duplicate policies. into release/1.4.x #18446
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Backport
This PR is auto-generated from #18419 to be assessed for backporting due to the inclusion of the label backport/1.4.x.
🚨
The person who merged in the original PR is:
@jrasell
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.
The below text is copied from the body of the original PR.
This change deduplicates the ACL policy list generated from ACL roles referenced within an ACL token on the client.
Previously the list could contain duplicates, which would cause erronous permission denied errors when calling client related RPC/ HTTP API endpoints. This is because the client calls the ACL get policies endpoint which subsequently ensures the caller has permission to view the ACL policies. This check is performed by comparing the requested list args with the policies referenced by the caller ACL token. When a duplicate is present, this check fails, as the check must ensure the slices match exactly.
The linked issue has details on how to reproduce the problem, if readers want to test this before and after the code changes.
Closes #17201
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