[infra] Add missing build targets to windows arm64 AOT builders

Change-Id: I995d739948858473d8213262509910b158c04ef5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/312985
Reviewed-by: William Hesse <whesse@google.com>

tools/bots/test_matrix.json

@@ -1788,6 +1788,8 @@
           "script": "tools/build.py",
           "arguments": [
             "--no-goma",
+            "dart_precompiled_runtime",
+            "gen_snapshot",
             "runtime"
           ]
         },