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oobmigrations: Extract encryption tasks

Administrator requested to merge ef/38050 into ef/38050-encrypter

Created by: efritz

Cleanup encryption in the database and run background encryption as a worker task (not out-of-band migrations). Partial fix to #38050 (closed) and #38052 (closed).

This PR changes (roughly by commit):

  • Adds a background task to the worker service that encrypts/decrypts values in the database
  • Adds a ALLOW_DECRYPTION flag that stops encrypted writes and flips the background task direction
  • Updates encryption documentation and adds a changelog note
  • Removes four now redundant out-of-band migrations

Pre-work to this PR:

  • (#40050): Consolidates all encryption/decryption to the internal/encryption package (new helpers.go file)
  • (#40062): Adds a database utility that can encrypt records in batch

Test plan

Existing and new unit tests. End-to-end testing done by encrypting/decrypting values in a local instance.

Merge request reports