feat: bump gapic-generator to v1.38.0

[hebaalazzeh]

Description

• Bumps gapic-generator version to 1.38.0 in librarian.yaml.

Regenerates all packages and preview-packages with gapic-generator v1.38.0 via librarian generate --all.

Steps to Reproduce the Full Regeneration Diff

1. Prerequisites & Environment Setup

Ensure Go, Python 3.11+, and protoc (libprotoc 33.1 / 33.5) are installed and available in your $PATH:

# Verify protoc version
protoc --version

# Create and activate a Python virtual environment
python3 -m venv .venv
source .venv/bin/activate

# Install synthtool in the environment
pip install synthtool

2. Clean Locks, Synthtool Cache, & Export Template Directory

Synthtool caches templates locally under ~/.cache/synthtool/synthtool. Clear any stale locks, ensure a clean template clone, and export the template path:

# Remove any stale git locks if present
rm -f .git/index.lock
rm -f "$HOME/.cache/synthtool/synthtool/.git/index.lock"

# Clean existing synthtool cache
rm -rf "$HOME/.cache/synthtool/synthtool"

# Clone the latest synthtool repository
git clone https://github.com/googleapis/synthtool.git "$HOME/.cache/synthtool/synthtool"

# Export the templates path required by synthtool
export SYNTHTOOL_TEMPLATES="$HOME/.cache/synthtool/synthtool/synthtool/gcp/templates"

3. Clean Stale Workspace Artifacts

Remove any temporary build/staging directories left over from previous runs:

rm -rf packages/*/tmp preview-packages/*/tmp

4. Install Dependencies via Librarian

Install the exact tool versions specified in librarian.yaml (including gapic-generator 1.38.0, formatters, and linters):

go run github.com/googleapis/librarian/cmd/librarian@v0.31.0 install

5. Run Librarian Generation

Run librarian to regenerate all packages across the repository:

go run github.com/googleapis/librarian/cmd/librarian@v0.31.0 generate --all

6. Post-Generation Cleanup

Remove temporary staging artifacts:

rm -rf packages/*/tmp preview-packages/*/tmp

Note: updates to post-processing scripts in a separate PR stacked on top of this one.

[gemini-code-assist]

Code Review

This pull request updates the gapic-generator tool version to 1.38.0 and bumps the minimum google-api-core dependency version to 2.28.0 across multiple client post-processing configurations. It also cleans up several obsolete temporary post-processing patches. Regarding the feedback, there is an issue in datastore-integration.yaml where including .. include:: README.rst in the replacement block will cause duplicate content in the generated documentation.

[gemini-code-assist]

The before pattern matches starting from .. include:: multiprocessing.rst. Since .. include:: README.rst precedes this line in the generated index.rst file, it is not matched and will be preserved at the top of the file. Including .. include:: README.rst in the after block will therefore cause it to be duplicated in the final output. Removing it from the after block will prevent this duplication.

    after: |
      .. note::

[quirogas]

The changes to librarian.yaml look good to me. Let's wait for the generation tests to pass before merging this portion of the PR, though.

[parthea]

This PR contains changes to the post processing scripts which are not related to the update to gapic-generator==1.38.0. Please could you pull those changes out and propose them separately?