Implement message archive for EF persistence

[rbev]

This pull request introduces new archive-related entities to the EF Core persistence layer for both PostgreSQL and SQL Server, and updates the corresponding migration and model snapshot files. The main changes involve adding the ArchiveOperationEntity and related tables, as well as updating or removing some fields and indexes to support new archiving and retry features.

Key changes:

Archive and Retry Feature Additions

• Added the ArchiveOperationEntity and corresponding archive_operations table with fields for tracking archive operations, including batch and message counts, group info, and initiator details. [1] [2] [3]

Schema and Index Updates

• Added a composite index on Type and GroupId for the failed_message_groups table to optimize queries.

Migration and Model Maintenance

• Removed the migration for custom checks as it was accidentally pruned from the model snapshot in an earlier PR, it is included in the migration for this PR instead to align the model snapshot correctly. [1] [2] [3]
• Updated the model snapshot to include all new entities and schema changes.

[rbev]

Note: the migration here shows up as a move in this PR because I had to delete the previous one that was not included in the snapshot for the migration that followed it. Deleting it and including it in this migration was the simplest path to making them consistent.