fix(identity): add missing utils.py and sys.path setup

[madhununna]

Fixes #969

Concise description of the PR

Added missing utils.py to 03-AgentCore-identity/ and added sys.path setup to two notebooks that were missing it, because all three identity tutorial notebooks import setup_cognito_user_pool and reauthenticate_user from utils but no utils.py existed in that directory.

User experience

Before: Running any of the three identity tutorial notebooks fails immediately with ModuleNotFoundError: No module named 'utils' before any code executes.

After: The import succeeds and notebooks proceed normally past the setup cell.

Checklist

• I have reviewed the contributing guidelines
• Add your name to CONTRIBUTORS.md
• Are you uploading a dataset?
• Have you documented Introduction, Architecture Diagram, Prerequisites, Usage, Sample Prompts, and Clean Up steps in your example README?
• I agree to resolve any issues created for this example in the future
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Notebooks import setup_cognito_user_pool and reauthenticate_user from utils but no utils.py existed, causing ModuleNotFoundError.

• Add shared utils.py to 03-AgentCore-identity/ with both functions
• Add sys.path cell to the two 3LO notebooks that were missing it (inbound auth notebook already had the sys.path setup)

Fixes #969

Amazon Bedrock AgentCore Samples Pull Request

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Concise description of the PR

Changes to ..., because ...

User experience

Please share what the user experience looks like before and after this change

Checklist

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• I have reviewed the contributing guidelines
• Add your name to CONTRIBUTORS.md
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Are you uploading a dataset?
• Have you documented Introduction, Architecture Diagram, Prerequisites, Usage, Sample Prompts, and Clean Up steps in your example README?
• I agree to resolve any issues created for this example in the future.
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

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