fix(material/schematics): fix mdc migration schematics after rebasing (#25285)

Author: mmalerba

src/material/schematics/migration-utilities/BUILD.bazel

@@ -26,10 +26,7 @@ ts_library(
 
 spec_bundle(
     name = "unit_tests_bundle",
-    # Exclude the `node` devkit entry-point to avoid bundling native modules like
-    # `chokidar` and `fsevents`. These rely on native bindings and break with ESBuild.
-    external = ["@angular-devkit/core/node"],
-    platform = "node",
+    platform = "cjs-legacy",
     deps = [":unit_tests_lib"],
 )