lib: remove prefix from node.config schema namespaces

Remove redundant prefixes from keys in test and watch namespaces
in the node.config JSON schema. Keys like test-concurrency and
watch-path are now shown as concurrency and path within their
respective namespaces, with the prefixed versions kept as aliases
for backward compatibility.

Refs: #60904

Author: Aakash

lib/internal/options.js

@@ -106,8 +106,27 @@ function generateConfigJsonSchema() {
 
     // Add all options for this namespace
     for (const { 0: optionName, 1: optionType } of optionsMap) {
-      const keyWithoutPrefix = StringPrototypeReplace(optionName, '--', '');
-      namespaceProperties[keyWithoutPrefix] = createPropertyForType(optionType);
+      let keyWithoutPrefix = StringPrototypeReplace(optionName, '--', '');
+      const originalKey = keyWithoutPrefix;
+      const propertySchema = createPropertyForType(optionType);
+      
+      // For `test` and `watch` namespaces, remove the namespace prefix
+      // from keys to avoid redundancy (e.g., `test-concurrency` -> `concurrency`)
+      // Also add the prefixed version as an alias for backward compatibility
+      if (namespace === 'test' && keyWithoutPrefix.startsWith('test-')) {
+        keyWithoutPrefix = StringPrototypeReplace(keyWithoutPrefix, 'test-', '');
+        // Add alias: both `concurrency` and `test-concurrency` are valid
+        namespaceProperties[originalKey] = propertySchema;
+        namespaceProperties[keyWithoutPrefix] = propertySchema;
+      } else if (namespace === 'watch' && keyWithoutPrefix.startsWith('watch-')) {
+        keyWithoutPrefix = StringPrototypeReplace(keyWithoutPrefix, 'watch-', '');
+        // Add alias: both `path` and `watch-path` are valid
+        namespaceProperties[originalKey] = propertySchema;
+        namespaceProperties[keyWithoutPrefix] = propertySchema;
+      } else {
+        // For other namespaces or keys without prefix, add normally
+        namespaceProperties[keyWithoutPrefix] = propertySchema;
+      }
     }
 
     // Sort the namespace properties alphabetically
@@ -116,17 +135,6 @@ function generateConfigJsonSchema() {
       ArrayPrototypeMap(sortedNamespaceKeys, (key) => [key, namespaceProperties[key]]),
     );
     rootProperties[namespace].properties = sortedNamespaceProperties;
-
-    // For `test` and `watch` namespaces, avoid duplicating their options
-    // under `nodeOptions`. These namespaces already have dedicated sections
-    // at the root level.
-    if (namespace === 'test' || namespace === 'watch') {
-      for (const key of sortedNamespaceKeys) {
-        if (key in nodeOptions) {
-          delete nodeOptions[key];
-        }
-      }
-    }
   }
 
   // Sort the top-level properties by key alphabetically