perf: removes i18n.supportedLanguages from client config (#9209)

Similar to https://github.com/payloadcms/payload/pull/9195 but
specifically removing `i18n.supportedLanguages` from the client config.
This is a potentially large object that does not need to be sent through
the network when making RSC requests.

packages/payload/src/config/client.ts

@@ -45,7 +45,8 @@ export type ClientConfig = {
   collections: ClientCollectionConfig[]
   custom?: Record<string, any>
   globals: ClientGlobalConfig[]
-} & Omit<SanitizedConfig, 'admin' | 'collections' | 'globals' | ServerOnlyRootProperties>
+  i18n?: Omit<SanitizedConfig['i18n'], 'supportedLanguages'>
+} & Omit<SanitizedConfig, 'admin' | 'collections' | 'globals' | 'i18n' | ServerOnlyRootProperties>
 
 export const serverOnlyAdminConfigProperties: readonly Partial<ServerOnlyRootAdminProperties>[] = []
 
@@ -92,6 +93,14 @@ export const createClientConfig = ({
     }
   }
 
+  if (
+    'i18n' in clientConfig &&
+    'supportedLanguages' in clientConfig.i18n &&
+    clientConfig.i18n.supportedLanguages
+  ) {
+    delete clientConfig.i18n.supportedLanguages
+  }
+
   if (!clientConfig.admin) {
     clientConfig.admin = {} as ClientConfig['admin']
   }