docs(hermetic-build): Document process for updating golden files

[diegomarquezp]

Added instructions for updating golden files using the chore/test-hermetic-build branch.

[gemini-code-assist]

Summary of Changes

Hello @diegomarquezp, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the documentation for hermetic builds by providing a clear, actionable guide on how to update golden files. This enhancement ensures that developers have precise instructions for maintaining the integrity and consistency of generated libraries, which is crucial for reliable testing and development workflows.

Highlights

• New Documentation Section: A new section titled 'Updating the golden files' has been added to hermetic_build/DEVELOPMENT.md.
• Golden File Update Process: Detailed, step-by-step instructions are now provided for updating golden files, including cloning necessary repositories (googleapis, google-cloud-java), checking out specific branches/commits, and building/running a Docker image for library generation.
• Testing Branch Clarification: The documentation clarifies that the chore/test-hermetic-build branch in google-cloud-java is used for testing golden files, rather than storing entire libraries in the current repository.

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[gemini-code-assist]

Code Review

This pull request adds documentation for updating golden files. The new section is a great addition. I've left a couple of comments to improve the clarity of the instructions and fix an issue in the provided docker command. Once these are addressed, the documentation will be much easier for developers to follow.

[sonarqubecloud]

Quality Gate passed for 'gapic-generator-java-root'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed for 'java_showcase_integration_tests'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[diegomarquezp]

The integration test looks good after following these instructions.