Removes various custom headers logic sprinkled around in the backend.
It should automatically be applied to outgoing HTTP requests via the
CustomHeadersMiddleware.
This also removes decryption of SecureJSONData to populate custom
headers in ngalert which seemed to have caused a ton of CPU usage.
* Refactor migrations and tests for secrets kvstore
* Use fake secrets store as a shortcut on tests
* Update wire
* Use global migration logger
* Fix ds proxy tests
* Fix linting issues
* Rename data source test setup function
* Move SignedInUser to user service and RoleType and Roles to org
* Use go naming convention for roles
* Fix some imports and leftovers
* Fix ldap debug test
* Fix lint
* Fix lint 2
* Fix lint 3
* Fix type and not needed conversion
* Clean up messages in api tests
* Clean up api tests 2
* wip: Implement kvstore for secrets
* wip: Refactor kvstore for secrets
* wip: Add format key function to secrets kvstore sql
* wip: Add migration for secrets kvstore
* Remove unused Key field from secrets kvstore
* Remove secret values from debug logs
* Integrate unified secrets with datasources
* Fix minor issues and tests for kvstore
* Create test service helper for secret store
* Remove encryption tests from datasources
* Move secret operations after datasources
* Fix datasource proxy tests
* Fix legacy data tests
* Add Name to all delete data source commands
* Implement decryption cache on sql secret store
* Fix minor issue with cache and tests
* Use secret type on secret store datasource operations
* Add comments to make create and update clear
* Rename itemFound variable to isFound
* Improve secret deletion and cache management
* Add base64 encoding to sql secret store
* Move secret retrieval to decrypted values function
* Refactor decrypt secure json data functions
* Fix expr tests
* Fix datasource tests
* Fix plugin proxy tests
* Fix query tests
* Fix metrics api tests
* Remove unused fake secrets service from query tests
* Add rename function to secret store
* Add check for error renaming secret
* Remove bus from tests to fix merge conflicts
* Add background secrets migration to datasources
* Get datasource secure json fields from secrets
* Move migration to secret store
* Revert "Move migration to secret store"
This reverts commit 7c3f872072.
* Add secret service to datasource service on tests
* Fix datasource tests
* Remove merge conflict on wire
* Add ctx to data source http transport on prometheus stats collector
* Add ctx to data source http transport on stats collector test
