build: automatically select a random available port when running adev locally (#63740)

Previously we relied on the default port of 4200, but if it was already in use then we would run into issues where the cli provided a prompt which we were unable to respond to. Instead we now request port 0 which will automatically find an available port.

PR Close #63740

adev/BUILD.bazel

@@ -146,6 +146,10 @@ ng_application(
     ng_config = ":ng_config",
     node_modules = "//adev:node_modules",
     project_name = "angular-dev",
+    serve_args = config_based_architect_flags + [
+        "--port",
+        "0",
+    ],
 )
 
 ng_test(