feat(ivy): enable .ngfactory.js generation in g3 only (#25392)

This turns on generation of ngfactory.js files when compiling in Ivy
mode in g3. They're not turned on for Bazel users as there appears to
be a strange interaction with the way our tests run in Bazel mode.

PR Close #25392

packages/bazel/src/ng_module.bzl

@@ -175,6 +175,8 @@ def _expected_outs(ctx):
                 metadata = [".metadata.json"]
             else:
                 devmode_js = [".js"]
+                if not _is_bazel():
+                    devmode_js += ".ngfactory.js"
                 summaries = []
                 metadata = []
         elif include_ng_files and short_path.endswith(".css"):

packages/bazel/src/ngc-wrapped/index.ts

@@ -127,7 +127,11 @@ export function compile({allowNonHermeticReads, allDepsCompiledWithBazel = true,
 
   // Disable downleveling and Closure annotation if in Ivy mode.
   if (isInIvyMode) {
-    compilerOpts.annotateForClosureCompiler = false;
+    // In pass-through mode for TypeScript, we want to turn off decorator transpilation entirely.
+    // This causes ngc to be have exactly like tsc.
+    if (compilerOpts.enableIvy === 'tsc') {
+      compilerOpts.annotateForClosureCompiler = false;
+    }
     compilerOpts.annotationsAs = 'decorators';
   }