fix: prevent replay of consumed verification values

[RohinBhargava]

Consumed verification values can be reinserted when a transaction removes a managed entity from the identity map and a later parent-context write flushes it. This allows a consumed value to become usable again before expiry. Read the consumption snapshot with disableIdentityMap: true and remove unsetIdentity, while retaining the guarded delete and affected-row check.

Add PostgreSQL regression coverage for later writes, transaction/parent-context flushes, and two racing consumers; run it in the CI matrix. Include a patch changeset.

Validation: reproduced the transaction regression against unmodified source on MikroORM 7.1.8 and 7.2.1. Fixed PostgreSQL tests pass on both; full suite on 7.1.8 passes (114 passed, 36 skipped), and package build passes. Standalone test typechecking has a pre-existing cast error in the sealed-secret fixture.

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