01-tutorials - [Bug]

The EvaluationClient initializes a boto3 client using the service name
"agentcore-evaluation-dataplane".

This service does not exist in the public boto3 service model, which results in
the following runtime error when running evaluation code:

botocore.exceptions.UnknownServiceError: Unknown service: 'agentcore-evaluation-dataplane'

AWS Bedrock AgentCore exposes the following valid services:
- bedrock-agentcore (runtime)
- bedrock-agentcore-control (control plane)

To resolve this issue, the EvaluationClient should initialize the boto3 client
using the correct runtime service:

boto3.client("bedrock-agentcore", region_name=self.region)

This change fixes the error and allows evaluation calls to execute successfully.

I have also raised PR for the same