🥕[Bug]: Update `validate` to catch 2 roles with the same name.

[JerryNixon]

What happened?

This should be illegal.

{
  "$schema": "https://github.com/Azure/data-api-builder/releases/download/v1.3.19/dab.draft.schema.json",
  "data-source": {
    "database-type": "mssql"
    "options": {
      "set-session-context": false
    }
  },
  "runtime": {
    "rest": {
      "enabled": true,
      "path": "/api",
      "request-body-strict": true
    },
    "graphql": {
      "enabled": true,
      "path": "/graphql",
      "allow-introspection": true
    },
    "host": {
      "cors": {
        "origins": [],
        "allow-credentials": false
      },
      "authentication": {
        "provider": "StaticWebApps"
      },
      "mode": "development"
    }
  },
  "entities": {
    "User": {
      "source": {
        "object": "dbo.User",
        "type": "table"
      },
      "permissions": [
        {
          "role": "anonymous",
          "actions": [
            {
              "action": "*"
            }
          ]
        },
        {
          "role": "jerry",
          "actions": [
            {
              "action": "*"
            }
          ]
        },
        {
          "role": "jerry",
          "actions": [
            {
              "action": "*"
            }
          ]
        }
      ]
    }
  }
}

Version

1.4

What database are you using?

Azure SQL

What hosting model are you using?

No response

Which API approach are you accessing DAB through?

No response

Relevant log output

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