🔧 fix: Remove Bedrock Config Transform introduced in #9931 (#10628)

* 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.

api/server/services/Endpoints/bedrock/options.js

@@ -1,4 +1,3 @@
-const { resolveHeaders } = require('@librechat/api');
 const { HttpsProxyAgent } = require('https-proxy-agent');
 const {
   AuthType,
@@ -89,14 +88,6 @@ const getOptions = async ({ req, overrideModel, endpointOption }) => {
     llmConfig.endpointHost = BEDROCK_REVERSE_PROXY;
   }
 
-  if (llmConfig.additionalModelRequestFields) {
-    llmConfig.additionalModelRequestFields = resolveHeaders({
-      headers: llmConfig.additionalModelRequestFields,
-      user: req.user,
-      body: req.body,
-    });
-  }
-
   return {
     /** @type {BedrockClientOptions} */
     llmConfig,