* chore: add alias for InitTestDB and Session
Adds an alias for the sqlstore InitTestDB and Session, and updates tests using these to reduce dependencies on the sqlstore.Store.
* next pass of removing sqlstore imports
* last little bit
* remove mockstore where possible
* SQLStore: Ensure that sessions are always closed
Delete `NewSession()` in favour of `WithDbSession()`
* Add WithDbSessionForceNewSession to the interface
* Apply suggestions from code review
* Encryption: Move secrets migrations into secrets.Migrator
* Encryption: Refactor secrets.Service initialization
* Encryption: Add support to run secrets migrations even when EE is disabled
* Encryption: Expose secrets migrations through HTTP API
* Update docs
* Fix docs links
* Some adjustments to makes errors explicit through HTTP response
* Encryption: Move secrets migrations into secrets.Migrator
* Encryption: Refactor secrets.Service initialization
* Encryption: Add support to run secrets migrations even when EE is disabled
* Init EE providers on-demand (only when needed)
* Add multiple tests + some adjustments
* Apply feedback
