feat: add nested global field support in test config and helpers

Adds NESTED_GLOBAL_FIELD_UID environment variable support and a 671-line
comprehensive test suite for nested global fields.

test/config.js:
- Added nested global field entry reading from NESTED_GLOBAL_FIELD_UID
- Added fallback env var names for global fields (GLOBAL_FIELD_UID,
  SIMPLE/MEDIUM/COMPLEX_GLOBAL_FIELD_UID) for broader stack compatibility

test/helpers/TestDataHelper.js:
- Added getNestedGlobalFieldUID() accessor method

test/integration/GlobalFieldsTests/NestedGlobalField.test.js (new):
- 671-line test suite for nested global field resolution
- Covers: 6-level deep nesting, child field access, projection with
  nested fields, reference resolution inside nested structures,
  array handling, and circular reference safety

Author: aniket-shikhare-cstk

.talismanrc

@@ -8,9 +8,11 @@ fileignoreconfig:
 - filename: test/integration/LivePreviewTests/LivePreview.test.js
   checksum: dba41fa432524189234a3d0ec35885a8e5c51904b3114853a41b1ec3899ad4cb
 - filename: test/config.js
-  checksum: 55c700357e33032d4b5c52f98be14aafdf71d7ed72223c39a42e3310e829e532
+  checksum: 61bf7129a251984c6114941211ce4ea3d29416ddf1288b605c3bb2a6639b17cc
 - filename: test/integration/GlobalFieldsTests/ContentBlockGlobalField.test.js
   checksum: 8d2bc8cb6661336b57397649259f7e12786256706019efb644f133b336629d96
+- filename: test/integration/GlobalFieldsTests/NestedGlobalField.test.js
+  checksum: 703722cca153df62ffb3cb32fcfc2722d509607e6b91682282df5063650423d1
 - filename: test/integration/NetworkResilienceTests/RetryLogic.test.js
   checksum: 3b5fe23398bdc2327848b3caa95339e51a0aed059c1eb299e78d3dd215ecbd30
 - filename: test/integration/QueryTests/ExistsSearchOperators.test.js

test/config.js

@@ -90,12 +90,14 @@ module.exports = {
   },
 
   // Global field UIDs (values from environment variables, keys are descriptive)
+  // Supports both old naming (GLOBAL_FIELD_SIMPLE) and new naming (SIMPLE_GLOBAL_FIELD_UID)
   globalFields: {
-    seo: process.env.GLOBAL_FIELD_SIMPLE,               // Simple global field
-    gallery: process.env.GLOBAL_FIELD_MEDIUM,           // Medium complexity
-    content_block: process.env.GLOBAL_FIELD_COMPLEX,    // Complex global field
+    seo: process.env.GLOBAL_FIELD_SIMPLE || process.env.GLOBAL_FIELD_UID || process.env.SIMPLE_GLOBAL_FIELD_UID,  // Simple global field
+    gallery: process.env.GLOBAL_FIELD_MEDIUM || process.env.MEDIUM_GLOBAL_FIELD_UID,           // Medium complexity
+    content_block: process.env.GLOBAL_FIELD_COMPLEX || process.env.COMPLEX_GLOBAL_FIELD_UID,    // Complex global field
     video_experience: process.env.GLOBAL_FIELD_VIDEO,   // Video field
-    referenced_data: 'referenced_data'                  // Generic field name (optional)
+    referenced_data: 'referenced_data',                  // Generic field name (optional)
+    nested: process.env.NESTED_GLOBAL_FIELD_UID         // Nested global field (parent)
   },
 
   // Reference field name (generic/common field name)

test/helpers/TestDataHelper.js

@@ -132,13 +132,22 @@ class TestDataHelper {
 
   /**
    * Get global field name
-   * @param {string} name - Global field name (seo, search, video_experience, content_block, gallery, referenced_data)
+   * @param {string} name - Global field name (seo, search, video_experience, content_block, gallery, referenced_data, nested)
    * @returns {string} Global field name
    */
   static getGlobalField(name) {
     return config.globalFields[name];
   }
 
+  /**
+   * Get nested global field UID
+   * Value from NESTED_GLOBAL_FIELD_UID in .env
+   * @returns {string} Nested global field UID
+   */
+  static getNestedGlobalFieldUID() {
+    return config.globalFields.nested;
+  }
+  
   /**
    * Get reference field name
    * @param {string} name - Reference field name (author, related_articles, products, references)