Migrate Cloud Build usage to Python client

[jrmccluskey]

Migrates from the apitools cloud build client to the modern Python Client library. This migration is largely 1:1, as the generated client methods and types had equivalents in the modern library. Also adds the cloud build client library as a gcp dependency.

Fixes #37259

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Summary of Changes

Hello @jrmccluskey, 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 modernizes the Apache Beam Python SDK's integration with Google Cloud Build. It replaces the use of an older, generated apitools client for Cloud Build operations with the officially supported google-cloud-build Python client library. This change ensures compatibility with current Google Cloud API practices and streamlines future maintenance of the Cloud Build integration.

Highlights

• Client Library Migration: Migrated Cloud Build API interactions from the deprecated apitools library to the official google-cloud-build Python client library.
• Codebase Cleanup: Removed the old, generated apitools Cloud Build client files from the codebase, simplifying the project structure.
• Dependency Update: Added google-cloud-build as a new dependency in setup.py to support the new client library.
• API Call Modernization: Updated sdk_container_builder.py to use the new client's classes and methods for creating and managing Cloud Build jobs, ensuring compatibility with current Google Cloud API practices.

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[jrmccluskey]

@gemini-code-assist review

[github-actions]

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R: @tvalentyn for label python.

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[tvalentyn]

LGTM. could you please try to see if the PR is importable before merging?