test(integration): standardize setup and rollback fixtures

[ddlees]

Description

This change centralizes integration test setup, schema assertion, driver detection, graph cleanup, and rollback fixture handling in the shared integration harness. It keeps the existing setup helpers available while adding a Session-based API for clearer cleanup behavior and reusable fixture rollback flows across Cypher integration tests.

Resolves: PQE-426

Type of Change

• Chore (a change that does not modify the application functionality)
• Bug fix (a change that fixes an issue)
• New feature / enhancement (a change that adds new functionality)
• Refactor (no behaviour change)
• Test coverage
• Build / CI / tooling
• Documentation

Testing

• Unit tests added / updated
• Integration tests added / updated
• Full test suite run (make test_all with CONNECTION_STRING set)

Screenshots (if appropriate):

Driver Impact

• PostgreSQL driver (drivers/pg)
• Neo4j driver (drivers/neo4j)

Checklist

• Code is formatted
• All existing tests pass
• go.mod / go.sum are up to date if dependencies changed

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