Add RecordCountValidatingPostProcessor

[kmontemayor2-sc]

Scope of work done

Doing this to verify our e2e tests are successful :P May be useful in the future to make sure people are exporting the correct number of embeddings/etc.

• Adds RecordCountValidatingPostProcessor, a new post-processor that validates output BQ table integrity after inference. For each node type, it checks that the unenumerated embeddings/predictions tables exist and have the same row count as the corresponding enumerated_node_ids_bq_table from preprocessing. All errors are collected and reported together before failing.
• Refactors PostProcessor to use protected (_) methods instead of name-mangled (__) methods, enabling clean subclassing without changing the public API.
• Wires the new validator into all 4 link prediction e2e test configs (cora, dblp, and their graph store variants), so our e2e pipelines now automatically catch row count mismatches or missing output tables that would previously go undetected.

Where is the documentation for this feature?: N/A

Did you add automated tests or write a test plan?

Updated Changelog.md? NO

Ready for code review?: NO

[kmontemayor2-sc]

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