docs: add transactional integration test guidance

[AmanVarshney01]

Summary

• add integration-testing guidance for per-test rollback with Prisma interactive transactions
• show how to pass a transaction client into code under test
• document when savepoint-style nested transaction behavior needs a community helper or a different app structure
• mirror the guidance in current and v6 integration testing docs

Root cause

The testing docs covered database cleanup between suites, but did not explain how to run real database tests with per-test transaction isolation or what to do when code needs savepoint-style nested transaction behavior.

Validation

• pnpm exec cspell content/docs/orm/prisma-client/testing/integration-testing.mdx content/docs/orm/v6/prisma-client/testing/integration-testing.mdx cspell.json --show-context
• git diff --check

Fixes #6604

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	May 26, 2026, 1:38 PM