refactor(@schematics/angular): remove protractor e2e schematic

Protractor is no longer supported and has been deprecated since v19.

Author: hawkgs

packages/schematics/angular/collection.json

@@ -23,12 +23,6 @@
       "schema": "./application/schema.json",
       "description": "Create an Angular application."
     },
-    "private-e2e": {
-      "factory": "./e2e",
-      "schema": "./e2e/schema.json",
-      "description": "PRIVATE API - Do not use.",
-      "hidden": true
-    },
     "class": {
       "aliases": ["cl"],
       "factory": "./class",

packages/schematics/angular/e2e/files/protractor.conf.js.template

@@ -19,7 +19,6 @@
     "less": "^4.2.0",
     "postcss": "^8.5.3",
     "prettier": "^3.8.1",
-    "protractor": "~7.0.0",
     "rxjs": "~7.8.0",
     "tailwindcss": "^4.1.12",
     "@tailwindcss/postcss": "^4.1.12",

packages/schematics/angular/e2e/files/src/app.e2e-spec.ts.template

@@ -35,10 +35,21 @@ export enum Builders {
   BuildDevServer = '@angular/build:dev-server',
   ExtractI18n = '@angular-devkit/build-angular:extract-i18n',
   BuildExtractI18n = '@angular/build:extract-i18n',
-  Protractor = '@angular-devkit/build-angular:private-protractor',
   BuildApplication = '@angular/build:application',
 }
 
+/**
+ * An enum of E2E external builders.
+ * Each enum value provides the fully qualified name of the associated builder.
+ */
+enum E2eExternalBuilders {
+  Playwright = 'playwright-ng-schematics:playwright',
+  Cypress = '@cypress/schematic:cypress',
+  Nightwatch = '@nightwatch/schematics:nightwatch',
+  WebdriverIO = '@wdio/schematics:wdio',
+  Puppeteer = '@puppeteer/ng-schematics:puppeteer',
+}
+
 export interface FileReplacements {
   replace: string;
   with: string;
@@ -123,11 +134,10 @@ export interface ExtractI18nOptions {
 }
 
 export interface E2EOptions {
-  protractorConfig: string;
   devServerTarget: string;
 }
 
-export interface BuilderTarget<TBuilder extends Builders, TOptions> {
+export interface BuilderTarget<TBuilder extends Builders | E2eExternalBuilders, TOptions> {
   builder: TBuilder;
   options: TOptions;
   configurations?: {
@@ -143,7 +153,7 @@ export type AppShellBuilderTarget = BuilderTarget<Builders.AppShell, AppShellBui
 export type TestBuilderTarget = BuilderTarget<Builders.Karma, TestBuilderOptions>;
 export type ServeBuilderTarget = BuilderTarget<Builders.DevServer, ServeBuilderOptions>;
 export type ExtractI18nBuilderTarget = BuilderTarget<Builders.ExtractI18n, ExtractI18nOptions>;
-export type E2EBuilderTarget = BuilderTarget<Builders.Protractor, E2EOptions>;
+export type E2EBuilderTarget = BuilderTarget<E2eExternalBuilders, E2EOptions>;
 
 interface WorkspaceCLISchema {
   warnings?: Record<string, boolean>;