Improve AWS credential handling to support EC2 instance profiles

[doronbl]

Amazon Bedrock Agent Samples Pull Request

Instructions

• Do not erase any parts of this template that are not applicable to your pull request.
• If a section is not applicable, explicitly state the reason.
• • Tick the checkboxes for the items you have completed.
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Describe your changes

• [ x] Concise description of the PR

Changes to src/InlineAgent/agent/inline_agent.py because it is expecting local AWS profile and fails when running from an EC2 instance. This change should allow developers to run their code from cloud desktop, and run the 'production' code from an EC2 instance executing the InlineAgent in an EC2 instance.

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Issue ticket number and link

• Issue # (if applicable)

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All Submissions:

• [ x] Have you followed the guidelines in our Contributing document?
• [x ] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Are you uploading a dataset?
• Have you added contributions to RELEASE NOTES?

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New Example Submissions:

• [x ] Have you tested your code, and made sure the functionality runs successfully? Provide screenshots.
• Have you linted your Python code with black?
• Does this implementation use the shared tools src/utils/*. List them here:

Not applicable - this is an extension of existing code, not a new example.

• Does this implementation use the helper functions src/utils/*. List them here:

Not applicable - this is an extension of existing code, not a new example.

• Have you included your Agent Example name and introduction in README.md and examples/agents/README.md?
• Have you included your Multi-Agent Example name and introduction in README.md and examples/multi_agent_collaboration/README.md?
• 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.

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src/utils Submissions:

Changes to the utils folder won't be accepted. Instead, open a new issue.

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src/shared tool Submissions:

Changes to existing tools won't be accepted. Instead, open a new issue.

• Business justification for including a new tool

Not applicable - this is an extension of existing code, not a new tool.

• How is this tool implemented?
  • • AWS CDK
  • • AWS CloudFormation (recommended)

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• Add your name to CONTRIBUTORS.md :D