MONGOID-5885 Return value from transaction yield to caller instead of internal state

[comandeo-mongo]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes the return value of the Mongoid.transaction method to return the value yielded from the block instead of internal state. Previously, the method was returning the result of run_commit_callbacks rather than the block's return value.

Key changes:

• Modified the transaction method to properly return the block's yield value
• Added test coverage to verify the correct return value behavior

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
lib/mongoid/clients/sessions.rb	Fixed transaction method to return block value using tap to preserve return value while running callbacks
spec/mongoid/clients/transactions_spec.rb	Added test to verify transaction returns the block's value and restructured existing test setup

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