Added transaction error message in osm (GONRG-6800)

Yurii Ruban [EPAM / GCP]requested to merge
add-transaction-error-message into master

Description:

Added describing error for the datastore transaction.

How to test:

Check the message in the register service (or other services) with an error conflict in the datastore transaction.

Changes include:

  • Refactor (a non-breaking change that improves code maintainability).

Changes in:

  • GCP

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