feat: Added support for region-prefixed Bedrock models

[Bkmakwana2002]

Added feature to Node agent to match cross-region inference model names in Bedrock

Description

This PR adds support to the Node agent for matching cross-region inference model names in Bedrock. Some newer Bedrock models use region-prefixed names (e.g., us.anthropic.claude-xyz) for cross-region inference optimization. The Node agent now correctly identifies and reports these models.

How to Test

1. Run the Node application with the Node agent configured.
2. Navigate to the AI Response section in the New Relic dashboard.
3. Verify that the response metadata now includes the full, region-prefixed model name. A screenshot
   demonstrating this is attached.

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Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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[jsumners-nr]

Looks good to me.

[bizob2828]

@Bkmakwana2002 this wasn't targetting main so this will never get released. I've opened #2947 so it can get into main and be released. In the future please make sure you target main for all PRs, otherwise it'll just hang out in a branch