Encryption: Refactor securejsondata.SecureJsonData to stop relying on global functions (#38865)

* Encryption: Add support to encrypt/decrypt sjd

* Add datasources.Service as a proxy to datasources db operations

* Encrypt ds.SecureJsonData before calling SQLStore

* Move ds cache code into ds service

* Fix tlsmanager tests

* Fix pluginproxy tests

* Remove some securejsondata.GetEncryptedJsonData usages

* Add pluginsettings.Service as a proxy for plugin settings db operations

* Add AlertNotificationService as a proxy for alert notification db operations

* Remove some securejsondata.GetEncryptedJsonData usages

* Remove more securejsondata.GetEncryptedJsonData usages

* Fix lint errors

* Minor fixes

* Remove encryption global functions usages from ngalert

* Fix lint errors

* Minor fixes

* Minor fixes

* Remove securejsondata.DecryptedValue usage

* Refactor the refactor

* Remove securejsondata.DecryptedValue usage

* Move securejsondata to migrations package

* Move securejsondata to migrations package

* Minor fix

* Fix integration test

* Fix integration tests

* Undo undesired changes

* Fix tests

* Add context.Context into encryption methods

* Fix tests

* Fix tests

* Fix tests

* Trigger CI

* Fix test

* Add names to params of encryption service interface

* Remove bus from CacheServiceImpl

* Add logging

* Add keys to logger

Co-authored-by: Emil Tullstedt <emil.tullstedt@grafana.com>

* Add missing key to logger

Co-authored-by: Emil Tullstedt <emil.tullstedt@grafana.com>

* Undo changes in markdown files

* Fix formatting

* Add context to secrets service

* Rename decryptSecureJsonData to decryptSecureJsonDataFn

* Name args in GetDecryptedValueFn

* Add template back to NewAlertmanagerNotifier

* Copy GetDecryptedValueFn to ngalert

* Add logging to pluginsettings

* Fix pluginsettings test

Co-authored-by: Tania B <yalyna.ts@gmail.com>
Co-authored-by: Emil Tullstedt <emil.tullstedt@grafana.com>

pkg/tests/api/alerting/api_notification_channel_test.go

@@ -1727,7 +1727,7 @@ var expEmailNotifications = []*models.SendEmailCommandSync{
 				"Message": "",
 				"Status":  "firing",
 				"Alerts": channels.ExtendedAlerts{
-					{
+					channels.ExtendedAlert{
 						Status:       "firing",
 						Labels:       template.KV{"alertname": "EmailAlert"},
 						Annotations:  template.KV{},