chore(librarian): onboard to librarian

[parthea]

Towards googleapis/librarian#2461

[gemini-code-assist]

Summary of Changes

Hello @parthea, 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 integrates the google-cloud-storage library with the librarian code generation system. The changes involve restructuring build-related files, consolidating project metadata, and updating version numbers to facilitate automated generation and maintenance. This move aims to streamline the development workflow and ensure consistency across generated components.

Highlights

• Librarian Onboarding: The project is being onboarded to the librarian code generation system, centralizing configuration and build processes.
• Configuration Relocation: Key configuration files such as noxfile.py and setup.py have been moved into a new .librarian/generator-input directory to align with the librarian structure.
• Build Process Streamlining: The owlbot.py script (now .librarian/generator-input/librarian.py) has been simplified, removing specific environment variable exports and using broader glob patterns for file exclusions.
• Version Updates: The library version has been consistently updated to 3.6.0 across relevant metadata and version files.

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[gemini-code-assist]

Code Review

This pull request onboards the python-storage library to the librarian tool. This involves adding new configuration files under the .librarian directory, such as .repo-metadata.json, librarian.py (renamed from owlbot.py), noxfile.py, setup.py, and state.yaml. The changes also include updating version numbers and CI configurations. My review focuses on the correctness of these new configuration files. I've found a couple of potential issues in setup.py and state.yaml that could affect CI and the build process.