chore: remove compile protos from post processor

[gcf-owl-bot[bot]]

• chore: remove compile protos from post processor

Source-Link: https://github.com/googleapis/synthtool/commit/73248044166b6ba2dd102862f8cd2c4829e868db Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:bfe4592953269bfa8d135200ca1b17809f106a337a885d7ecc12cd2a9998e98a

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (58925d3) 69.50% compared to head (72c8421) 69.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #912 +/- ## ======================================= Coverage 69.50% 69.50% ======================================= Files 7 7 Lines 1256 1256 Branches 48 48 ======================================= Hits 873 873 Misses 382 382 Partials 1 1 ```

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