chore: update generator logic for nodejs_gapic_combined_pkg rule, and update templates (#2423)

* chore: update generator logic for nodejs_gapic_combined_pkg rule, and update templates

PiperOrigin-RevId: 808677883

Source-Link: googleapis/googleapis@a32846d

Source-Link: googleapis/googleapis-gen@593da26
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiNTkzZGEyNjUyZjJjNDNiNzY5ZGZlYjE5MTYxYTNiZTk1NWY5NzY3NCJ9

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: alkatrivedi <58396306+alkatrivedi@users.noreply.github.com>

Author: gcf-owl-bot[bot]

.OwlBot.yaml

@@ -0,0 +1,19 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+deep-copy-regex:
+    - source: /google/spanner/executor/google-spanner-executor-nodejs
+      dest: /owl-bot-staging/google-spanner-executor
+
+api-name: executor