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Report failures in batched background migration scheduling and sampling

Simon Tomlinson requested to merge report-batched-migration-failures into master

What does this MR do and why?

Describe in detail what your merge request does and why.

Includes details about batched background migration scheduling in the migration testing pipeline. Also includes a "failed" migration record if a batch fails. Previously, the batch would simply not be written since the exception would keep the files from being written.

This provides the data necessary to solve Display that a background migration has failed ... (gitlab-org/database-team/gitlab-com-database-testing#65 - closed) and Record and display scheduling queries for batch... (gitlab-org/database-team/gitlab-com-database-testing#68)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Simon Tomlinson

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