test: AWS MCP integration tests

[detti456]

Summary

Changes

Integration tests are added for AWS MCP happy path scenarios (ensuring all tool calls return a valid response), and negative scenarios (expired credentials).

User experience

There is no change in the user experience.

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• I have reviewed the contributing guidelines
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Is this a breaking change? (Y/N)

• Yes
• No

Please add details about how this change was tested.

• Did integration tests succeed?
• If the feature is a new use case, is it necessary to add a new integration test case?

Acknowledgment

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[wzxxing]

Thanks for adding the tests and fixing some typos.