Remove cockroach shadow db transaction

[GustavoEdinger]

This pull request removes the special handling for CockroachDB when applying the migrations to the shadow db as it breaks under certain conditions, and it's against the recommendation from CockroachDB.

I understand that this reverts #5138, which was intended to speed up migrate dev.
Unfortunately, it breaks when the migrations in the project have the following steps:

--- Migration file 1
CREATE TYPE "Color" AS ENUM ('Black', 'White');

--- Migration file 2
ALTER TYPE "Color" ADD VALUE 'Red';

---  Migration file 3
ALTER TABLE "MyTable" ADD COLUMN     "selected_color" "Color" NOT NULL DEFAULT 'Red';

The change in the type it's only avaialable after the it's committed due to cockroach limitations.

Here's an example of the error:

Error: P3006

Migration `20250225160003_migration_3` failed to apply cleanly to the shadow database. 
Error:
ERROR: invalid input value for enum Color: "Red"
   0: schema_core::state::DevDiagnostic
             at schema-engine/core/src/state.rs:294

As stated in the documentation running inside a transaction is not supported by the database. https://www.cockroachlabs.com/docs/stable/online-schema-changes

The workaround suggested by the documentation would be to set SET autocommit_before_ddl = on; which would auto commit the schema changes inside a transaction but that's only available from cockroachdb 24.1. Meaning prisma would have to set a min db version. https://www.cockroachlabs.com/docs/v24.1/online-schema-changes#enable-automatic-commit-before-running-schema-changes-inside-transactions

/test-all

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[Copilot]

Pull Request Overview

This PR removes special CockroachDB transaction handling during shadow database migrations that was causing failures with certain migration sequences, specifically when adding enum values and then using them in subsequent migrations within the same transaction.

Key changes:

• Removes the BEGIN; and COMMIT; transaction wrapping for CockroachDB migrations in the shadow database
• Eliminates special-case logic that violated CockroachDB's documented limitations around DDL statements in transactions

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[codspeed-hq]

CodSpeed Performance Report

Merging #5669 will not alter performance

_{Comparing GustavoEdinger:fix/cockroach-shadowdb-transaction (fb2f69e) with main (08761dd)}

Summary

✅ 11 untouched