refactor(ivy): revert onChanges change back to a feature (#28187)

- adds fixmeIvy annotation to tests that should remain updated so we can resolve those issues in the subsequent commits

PR Close #28187

packages/core/src/render3/jit/environment.ts

@@ -31,6 +31,7 @@ export const angularCoreEnv: {[name: string]: Function} = {
   'inject': inject,
   'ɵinjectAttribute': r3.injectAttribute,
   'ɵtemplateRefExtractor': r3.templateRefExtractor,
+  'ɵNgOnChangesFeature': r3.NgOnChangesFeature,
   'ɵProvidersFeature': r3.ProvidersFeature,
   'ɵInheritDefinitionFeature': r3.InheritDefinitionFeature,
   'ɵelementAttribute': r3.elementAttribute,