fix: support concurrent indexes in shadow db replay

[zacharyliu]

Support for multiple CREATE INDEX CONCURRENTLY statements in migrations was added in #5767. Shadow DB migration replay still used a separate raw SQL execution path, causing shadow creation to fail if a migration existed with multiple CREATE INDEX CONCURRENTLY:

Error: P3006

Migration `20260316120000_<migration_name>` failed to apply cleanly to the shadow database. 
Error:
ERROR: CREATE INDEX CONCURRENTLY cannot run inside a transaction block
   0: schema_core::state::DevDiagnostic
             at schema-engine/core/src/state.rs:314

This PR updates the shadow database migration path to use the new migration script logic.

This fixes the issue in prisma/prisma#14456 (comment).

Summary by CodeRabbit

Release Notes

• Bug Fixes
  • Improved PostgreSQL database migration execution with enhanced handling for concurrent index operations
  • Increased reliability in migration application

[coderabbitai]

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ℹ️ Recent review info

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Configuration used: Organization UI

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Run ID: 2de92956-e78a-4870-b2d8-30a17f89c58f

📥 Commits

Reviewing files that changed from the base of the PR and between 75cbdc1 and c063b81.

📒 Files selected for processing (2)

• schema-engine/connectors/sql-schema-connector/src/flavour/postgres.rs
• schema-engine/sql-migration-tests/tests/migrations/postgres.rs

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Walkthrough

Updates the PostgreSQL migration execution path to use apply_migration_script instead of raw_cmd, and adds a new test verifying correct handling of multiple CREATE INDEX CONCURRENTLY statements during migration generation.

Changes

Cohort / File(s)	Summary
Migration Execution Path schema-engine/connectors/sql-schema-connector/src/flavour/postgres.rs	Changed migration application to call apply_migration_script() instead of raw_cmd(), removing explicit error mapping that is now handled internally.
Postgres Migration Tests schema-engine/sql-migration-tests/tests/migrations/postgres.rs	Added test postgres_create_migration_works_with_multiple_create_index_concurrently_statements that verifies migrations with multiple CREATE INDEX CONCURRENTLY statements are applied correctly.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix: support concurrent indexes in shadow db replay' directly matches the main change: updating shadow database migration replay to handle multiple CREATE INDEX CONCURRENTLY statements.

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