Mark `finalize_background_migration` as not supporting `[2.0]`
What does this MR do and why?
Currently, the #finalize_background_migration due to hardcoded
database tracking does not support Migration[2.0] and raises
an errors trying to use it with multiple databases.
Raise the exception for now to avoid bugs merged into production.
Related:
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Kamil Trzciński