* fix: Header and Environment Variable Handling Bug from #9931
* refactor: Remove warning log for missing tokens in extractOpenIDTokenInfo function
* feat: Enhance resolveNestedObject function for improved placeholder processing
- Added a new function `resolveNestedObject` to recursively process nested objects, replacing placeholders in string values while preserving the original structure.
- Updated `createTestUser` to use `IUser` type and modified user ID generation.
- Added comprehensive unit tests for `resolveNestedObject` to cover various scenarios, including nested structures, arrays, and custom user variables.
- Improved type handling in `processMCPEnv` to ensure correct processing of mixed numeric and placeholder values.
* refactor: Remove unnecessary manipulation of Bedrock options introduced in #9931
- Eliminated the resolveHeaders function call from the getOptions method in options.js, as it was no longer necessary for processing additional model request fields.
- This change simplifies the code and improves maintainability.
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