Add test coverage of rails_info reconciliation scenarios

What does this MR do and why?

Implements issue Add test coverage of rails_info config/version ... (#407160 - closed)

• Second in series of MRs, following Properly handle full and partial sync - Part 1 (!116475 - merged)
• There was one commit missed in this MR I forgot to push, it was added in Add more test coverage for reconciliation scena... (!117761 - merged)

Follow-up issue: Finish incomplete work on state management logi... (#407518)

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