refactor(upgrade): use Bazel packages to avoid symlinks in the source (#29466)

Previously we had to share code between upgrade/dynamic and upgrade/static
by symlinking the `src` folder, which allowed both packages to access
the upgrade/common files.

These symlinks are always problematic on Windows, where we had to run
a script to re-link them, and restore them.

This change uses Bazel packages to share the `upgrade/common` code,
which avoids the need for symlinking the `src` folder.

Also, the Windows specific scripts that fixup the symlinks have also
been removed as there is no more need for them.

PR Close #29466

packages/upgrade/BUILD.bazel

@@ -7,14 +7,13 @@ ng_module(
     srcs = glob(
         [
             "*.ts",
-            "src/common/**/*.ts",
-            "src/dynamic/**/*.ts",
+            "src/dynamic/src/*.ts",
         ],
     ),
     deps = [
         "//packages/core",
-        "//packages/platform-browser",
         "//packages/platform-browser-dynamic",
+        "//packages/upgrade/src/common",
         "@npm//zone.js",
     ],
 )