test(compiler): add signal-based bundling benchmark for safe navigation optimization

Adds packages/core/test/bundling/safe_nav — an Angular Signals admin dashboard
with 8 components and ~80 nullable signal bindings (user()?.name, order()?.id,
computed()?.revenue, etc.). Serves as a reproducible before/after benchmark for
the optimizeTemporaries and self-assignment-elimination compiler phases.

Signal reads are function calls that bundlers cannot inline, so the savings from
fewer let declarations appear in the final esbuild output. Measured savings on
this benchmark: 1,147 bytes raw / 425 bytes gzip (0.76% gzip reduction).

Author: sonukapoor

packages/core/test/bundling/safe_nav/BUILD.bazel

@@ -0,0 +1,21 @@
+load("@rules_angular//src/optimization:index.bzl", "optimize_angular_app")
+
+package(default_visibility = ["//visibility:public"])
+
+optimize_angular_app(
+    name = "bundles",
+    srcs = [
+        "main.ts",
+    ],
+    env = {
+        "NG_BUILD_MANGLE": "0",
+    },
+    deps = [
+        "//:node_modules/rxjs",
+        "//:node_modules/tslib",
+        "//packages/core/test/bundling:node_modules/@angular/build",
+        "//packages/core/test/bundling:node_modules/@angular/common",
+        "//packages/core/test/bundling:node_modules/@angular/core",
+        "//packages/core/test/bundling:node_modules/@angular/platform-browser",
+    ],
+)