Updated examples for acquiring tokens in Runtime

[massi-ang]

Amazon Bedrock AgentCore Samples Pull Request

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Issue number: #449

Concise description of the PR

Changes to the 2 notebooks to remove the usage of global variables and replace it with the correct way to handle security material with the agent

User experience

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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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[massi-ang]

ready for review

[massi-ang]

Fixed all the comments