Add README for the import automation infra

[vish-cs]

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[gemini-code-assist]

Summary of Changes

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This pull request significantly refactors the documentation for the import automation infrastructure. The main README now provides a clearer, architectural overview of the system, while specific operational and setup instructions have been relocated to the executor's README. This reorganization aims to improve the clarity and accessibility of information for different user needs, separating high-level understanding from detailed implementation guidance.

Highlights

• Documentation Restructuring: The primary README for the import automation system has been completely rewritten to provide a high-level architectural overview of the system, focusing on its core components: Import Job (Cloud Batch) and Ingestion Pipeline (Dataflow + Cloud Workflow).
• Operational Details Relocation: Detailed operational instructions, such as specifying import targets via git commits, importing to the dev graph, scheduling updates, and deployment procedures (including Cloud Build setup), have been moved from the main import-automation/README.md to the import-automation/executor/README.md.
• Cloud Build Documentation Consolidation: The standalone import-automation/cloudbuild/README.md file has been removed, and its relevant content describing the Cloud Build configuration and its purpose has been integrated into the updated import-automation/executor/README.md.

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[gemini-code-assist]

Code Review

This pull request refactors the documentation for the import automation infrastructure. The top-level README now provides a high-level overview, while detailed instructions for triggering imports via git commits have been moved to the executor's README. The changes improve the documentation structure. I've found a few typos and broken links in the new documentation that should be addressed.