refactor(expansion-service): simplify schema transform provider logic

[liferoad]

Remove redundant parsing and error handling for schema transform requests Directly use ExpansionServiceSchemaTransformProvider for all schema transform cases

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Summary of Changes

Hello @liferoad, 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 refactors the expansion service to streamline how schema transform requests are processed. The primary goal is to simplify the codebase by removing unnecessary parsing and error handling, ensuring that the ExpansionServiceSchemaTransformProvider is consistently and directly applied for all relevant schema transform operations. This change improves code clarity and reduces potential points of failure.

Highlights

• Simplified Schema Transform Logic: The logic for handling schema transform requests has been significantly simplified by removing redundant parsing and error handling.
• Direct Provider Usage: The ExpansionServiceSchemaTransformProvider is now directly used for all schema transform cases, eliminating previous conditional checks and payload parsing.
• Code Clean-up: Unused imports related to ExternalTransforms and InvalidProtocolBufferException have been removed, contributing to cleaner code.

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