Fix AccessDenied not recognized for MemoryDB/RSSL API calls

[greedy52]

Found while testing #30054, that some AWS APIs are returning 400 with AccessDeniedException. The existing conversion was only expecting 403 for access denied thus not flagging these with trace.AccessDenied

AccessDeniedException: User: <aws-role-arn> is not authorized to perform: redshift-serverless:GetWorkgroup on resource: <redshift-serverless-workgroup-arn> because no identity-based policy allows the redshift-serverless:GetWorkgroup action
{
  RespMetadata: {
    StatusCode: 400,
    RequestID: \"<request-id>\"
  },
  Message_: \"User: <aws-role-arn> is not authorized to perform: redshift-serverless:GetWorkgroup on resource: <redshift-serverless-workgroup-arn>  because no identity-based policy allows the redshift-serverless:GetWorkgroup action\"
}.

AccessDeniedException: User: <aws-role-arn>  is not authorized to perform: memorydb:DescribeClusters on resource: <memorydb-arn> because no identity-based policy allows the memorydb:DescribeClusters action
	status code: 400, request id: <request-id>. 

[public-teleport-github-review-bot]

@greedy52 See the table below for backport results.

Branch	Result
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branch/v12	Failed
branch/v13	Create PR