Revert "chore: remove compile protos from post processor" (#1544)

Revert "chore: remove compile protos from post processor (#1899)"

This reverts commit 73248044166b6ba2dd102862f8cd2c4829e868db.

Source-Link: googleapis/synthtool@2f0fea6
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:37f2f91dea317c75ebf4e19880aa8f10b2228b8d07859c0f384dbcf660735ba2

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: sofisl <[email protected]>

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest
-  digest: sha256:8b6a07a38d1583d96b6e251ba208bd4ef0bc2a0cc37471ffc518841651d15bd6
-# created: 2023-09-25T22:18:27.595486267Z
+  digest: sha256:37f2f91dea317c75ebf4e19880aa8f10b2228b8d07859c0f384dbcf660735ba2
+# created: 2023-11-28T20:22:21.420619474Z