feat: add global inference support for AWS Bedrock models

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Description

This PR attempts to address Issue #8750 by adding support for AWS Bedrock's Global Inference feature, which automatically routes requests to the optimal AWS region for supported models.

Changes

• ✅ Added awsUseGlobalInference setting to provider configuration schema
• ✅ Implemented global. prefix support in Bedrock provider for supported models
• ✅ Added UI checkbox for global inference in Bedrock settings (similar to cross-region inference)
• ✅ Prioritized global inference over cross-region when both are enabled
• ✅ Added comprehensive test suite with 21 test cases
• ✅ Support for global inference in custom ARN parsing

Supported Models

The following models support global inference:

• Claude Sonnet 4 (anthropic.claude-sonnet-4-20250514-v1:0)
• Claude Sonnet 4.5 (anthropic.claude-sonnet-4-5-20250929-v1:0)
• Claude Opus 4 (anthropic.claude-opus-4-20250514-v1:0)
• Claude Opus 4.1 (anthropic.claude-opus-4-1-20250805-v1:0)
• Claude 3.7 Sonnet (anthropic.claude-3-7-sonnet-20250219-v1:0)
• Claude Haiku 4.5 (anthropic.claude-haiku-4-5-20251001-v1:0)

Testing

• ✅ All new tests passing (21 test cases)
• ✅ No regressions in existing Bedrock tests
• ✅ Type checking passes
• ✅ Linting passes

UI Experience

The new global inference checkbox:

• Only appears for models that support global inference
• Disables cross-region inference when enabled (global takes priority)
• Follows the same UI pattern as the existing cross-region inference option

Fixes #8750

Feedback and guidance are welcome!

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Important

Adds global inference support for AWS Bedrock models, prioritizing it over cross-region inference, with UI updates and comprehensive tests.

• Behavior:
  • Adds awsUseGlobalInference setting to provider-settings.ts for AWS Bedrock models.
  • Implements global. prefix support in AwsBedrockHandler for supported models.
  • Prioritizes global inference over cross-region inference when both are enabled.
  • Supports global inference in custom ARN parsing in AwsBedrockHandler.
• UI:
  • Adds checkbox for global inference in Bedrock.tsx, disabling cross-region inference when enabled.
• Testing:
  • Adds bedrock-global-inference.spec.ts with 21 test cases for global inference behavior.
• Models:
  • Updates bedrock.ts to include models supporting global inference.
• Misc:
  • Updates settings.json for UI text related to global inference.

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According to the issue comment from @ronyblum, only Sonnet 4, Sonnet 4.5, and Haiku 4.5 support Global Inference. However, this constant includes Opus 4, Opus 4.1, and Claude 3.7 Sonnet which do not support global inference. Including unsupported models will cause the code to incorrectly apply the global. prefix to models that don't support it, potentially causing API errors. The list should only include: anthropic.claude-sonnet-4-20250514-v1:0, anthropic.claude-sonnet-4-5-20250929-v1:0, and anthropic.claude-haiku-4-5-20251001-v1:0.