docs(service-worker): add example app for SwPush API docs (#32139)

Previously, the `SwPush` API docs were using hard-coded code snippets.

This commit switches to using code snippets from an actual example app,
which ensures that the code shown in the docs will at least continue to
compile successfully.

PR Close #32139

packages/examples/service-worker/push/BUILD.bazel

@@ -0,0 +1,62 @@
+package(default_visibility = ["//visibility:public"])
+
+load("//tools:defaults.bzl", "ng_module", "ts_library")
+load("@npm_bazel_protractor//:index.bzl", "protractor_web_test_suite")
+load("@npm_bazel_typescript//:index.bzl", "ts_devserver")
+
+ng_module(
+    name = "sw_push_examples",
+    srcs = glob(
+        ["**/*.ts"],
+        exclude = ["**/*_spec.ts"],
+    ),
+    # TODO: FW-1004 Type checking is currently not complete.
+    type_check = False,
+    deps = [
+        "//packages/core",
+        "//packages/platform-browser",
+        "//packages/platform-browser-dynamic",
+        "//packages/service-worker",
+    ],
+)
+
+ts_library(
+    name = "sw_push_e2e_tests_lib",
+    testonly = True,
+    srcs = glob(["**/e2e_test/*_spec.ts"]),
+    tsconfig = "//packages/examples:tsconfig-e2e.json",
+    deps = [
+        "//packages/examples/test-utils",
+        "//packages/private/testing",
+        "@npm//@types/jasminewd2",
+        "@npm//protractor",
+    ],
+)
+
+ts_devserver(
+    name = "devserver",
+    entry_module = "@angular/examples/service-worker/push/main",
+    index_html = "//packages/examples:index.html",
+    port = 4200,
+    scripts = [
+        "//tools/rxjs:rxjs_umd_modules",
+        "@npm//:node_modules/tslib/tslib.js",
+    ],
+    static_files = [
+        "ngsw-worker.js",
+        "@npm//:node_modules/zone.js/dist/zone.js",
+    ],
+    deps = [":sw_push_examples"],
+)
+
+protractor_web_test_suite(
+    name = "protractor_tests",
+    data = ["//packages/bazel/src/protractor/utils"],
+    on_prepare = "start-server.js",
+    server = ":devserver",
+    deps = [
+        ":sw_push_e2e_tests_lib",
+        "@npm//protractor",
+        "@npm//selenium-webdriver",
+    ],
+)