[BUG] OpenSearch dashboards is not accesible for console user

[konokenj]

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Describe the bug

With Bedrock Knowledge Bases on custom bot, users can't access OpenSearch dashboard although user has AdministratorAccess.

There are no data access control granted to IAM Roles or Users used by human. It might be a good idea to be able to configurable the OpenSearch dashboard administrator role or user in cdk.json.

To Reproduce

Steps to reproduce the behavior:

1. Create custom bot with knowledges
2. Go to OpneSearch Serverless collection page on AWS Management Console
3. Click on 'dashboard' link
4. See error

Screenshots

Additional context

Add any other context about the problem here.