Geo: Fix registry backfilling

Problem

Example of the problem:

• If the model table has rows with ID 1, 2, 3.
• And the registry table has rows with foreign key ID 1, 2.
• Then RegistryConsistencyWorker should create registry row with foreign key 3.

Instead, it does this:

• First execution of RegistryConsistencyWorker, it does not create registry row with foreign key 3
• Second execution of RegistryConsistencyWorker, it does create the row
• Third execution it doesn't check anything
• Starts from beginning again

It should do this:

• First execution of RegistryConsistencyWorker, it does create the row
• Starts from beginning again

There wasn't initially an issue. I first opened !87720 (merged).

So this issue will just be used to track verification of the change in a GET deployment.