Restore the BackgroundMigration.remaining method
What does this MR do and why?
Related to #343047 (closed)
Add back the BackgroundMigration.remaining method because our documentation refers to it as a means to check for background migrations before an upgrade.
This method should continue to work for single-database installations, so we should leave it here until we are prepared to make a breaking change and we need to support multiple databases for self-managed.
MR acceptance checklist
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Edited by Patrick Bair