refactor(@angular-devkit/build-angular): remove Protractor builder and schematics

BREAKING CHANGE: Protractor is no longer supported.

Protractor was marked end-of-life in August 2023 (see https://protractortest.org/). Projects still relying on Protractor should consider migrating to another E2E testing framework, several support solid migration paths from Protractor.

* https://angular.dev/tools/cli/end-to-end
* https://blog.angular.dev/the-state-of-end-to-end-testing-with-angular-d175f751cb9c

Author: dgp1130

packages/angular/cli/lib/config/workspace-schema.json

@@ -368,7 +368,6 @@
                       "@angular-devkit/build-angular:prerender",
                       "@angular-devkit/build-angular:jest",
                       "@angular-devkit/build-angular:web-test-runner",
-                      "@angular-devkit/build-angular:protractor",
                       "@angular-devkit/build-angular:server",
                       "@angular-devkit/build-angular:ssr-dev-server"
                     ]
@@ -656,28 +655,6 @@
                 }
               }
             },
-            {
-              "type": "object",
-              "additionalProperties": false,
-              "properties": {
-                "builder": {
-                  "const": "@angular-devkit/build-angular:protractor"
-                },
-                "defaultConfiguration": {
-                  "type": "string",
-                  "description": "A default named configuration to use when a target configuration is not provided."
-                },
-                "options": {
-                  "$ref": "../../../../angular_devkit/build_angular/src/builders/protractor/schema.json"
-                },
-                "configurations": {
-                  "type": "object",
-                  "additionalProperties": {
-                    "$ref": "../../../../angular_devkit/build_angular/src/builders/protractor/schema.json"
-                  }
-                }
-              }
-            },
             {
               "type": "object",
               "additionalProperties": false,

packages/angular_devkit/build_angular/builders.json

@@ -42,10 +42,10 @@
       "schema": "./src/builders/web-test-runner/schema.json",
       "description": "Run unit tests with Web Test Runner."
     },
-    "protractor": {
+    "private-protractor": {
       "implementation": "./src/builders/protractor",
       "schema": "./src/builders/protractor/schema.json",
-      "description": "Run protractor over a dev server."
+      "description": "PRIVATE API - Do not use."
     },
     "server": {
       "implementation": "./src/builders/server",

packages/schematics/angular/collection.json

@@ -23,10 +23,10 @@
       "schema": "./application/schema.json",
       "description": "Create an Angular application."
     },
-    "e2e": {
+    "private-e2e": {
       "factory": "./e2e",
       "schema": "./e2e/schema.json",
-      "description": "Create an Angular e2e application.",
+      "description": "PRIVATE API - Do not use.",
       "hidden": true
     },
     "class": {

packages/schematics/angular/utility/workspace-models.ts

@@ -30,7 +30,7 @@ export enum Builders {
   NgPackagr = '@angular-devkit/build-angular:ng-packagr',
   DevServer = '@angular-devkit/build-angular:dev-server',
   ExtractI18n = '@angular-devkit/build-angular:extract-i18n',
-  Protractor = '@angular-devkit/build-angular:protractor',
+  Protractor = '@angular-devkit/build-angular:private-protractor',
   BuildApplication = '@angular/build:application',
 }