Revert "feat(ivy): use i18n locale data to determine the plural form of ICU expressions (#29249)" (#29918)

This reverts commit 6a8cca7975.

PR Close #29918

packages/core/src/render3/index.ts

@@ -100,7 +100,6 @@ export {
 } from './state';
 
 export {
-  DEFAULT_LOCALE_ID,
   ɵɵi18n,
   ɵɵi18nAttributes,
   ɵɵi18nExp,
@@ -110,8 +109,6 @@ export {
   ɵɵi18nPostprocess,
   i18nConfigureLocalize,
   ɵɵi18nLocalize,
-  getLocaleId,
-  setLocaleId,
 } from './i18n';
 
 export {NgModuleFactory, NgModuleRef, NgModuleType} from './ng_module_ref';