Backport of Remove duplicate policies when creating/updating identity groups into release/1.10.x #15453
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Backport
This PR is auto-generated from #15055 to be assessed for backporting due to the inclusion of the label backport/1.10.x.
The below text is copied from the body of the original PR.
Currently when adding policies to identity groups, the list is not deduplicated resulting in multiple copies of the same policy in an identity group.