[Feature Request] Add enableBedrockCrossRegionInference

## Describe the solution you'd like

In some organisations their SCP may restrict _global inference_ profiles while allowing the regional ones (e.g. US businesses may allow cross region inference in us-- but not global inference outside of the US). We should add support for `enableBedrockGlobalInference` that works the same as the existing `enableBedrockCrossRegionInference` and can be used for restricting access to global inference profiles.

## Implementation feasibility

Are you willing to collaborate with us to discuss the solution, decide on the approach, and assist with the implementation?

- [x] Yes, I am able to implement the feature and create a pull request.
- [ ] No, I am unable to implement the feature, but I am open to discussing the solution.

Locate the existing enableBedrockCrossRegionInference option and trace where it is defined, passed, and applied. Use that path as the starting point for the global-inference option; done means global inference profiles can be restricted independently while preserving the existing cross-region behavior.

Written by the indexing model from the issue text.