🐛Fix: ensure runnability of samples/agents

[danielykim]

Type of Issue

• Other

Description

This PR includes improvements to two notebook examples in the samples/agents directory to enhance runnability and consistency:

1. samples/agents/bedrock_agent_langgraph.ipynb
2. samples/agents/bedrock_agent_roc.ipynb

Key Changes

1. samples/agents/bedrock_agent_langgraph.ipynb

Reason for changes:

• on Step 3: Avoid using hard-coded variables by getting region names from boto3.session.Session()
• on Step 4: To ensure runnability by changing foundational_model as foundation_model
• on Step 5: Remove unused import
• on Step 6: ToolExecutor is deprecated as of version 0.2.0 and will be removed in 0.3.0.

2. samples/agents/bedrock_agent_roc.ipynb

• on Step 2 & 4: to make the variable name consistent with the argument of BedrockAgentsRunnable.create_agent()
• on Step 3: Avoid using hard-coded variables by getting region names from boto3.session.Session()

Test Configuration

• Python: 3.11.10
• OS/Distribution: Ubuntu 22.04.5 LTS

Review Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works