* refactor: renaming of files from database to store
* refactor: make service account store private
- moves store interface to manager package
- adds an interface to the ProvideAPI constructor
- refactors tests to use the store when necessary
- adds mocks for the new interface implementations in the tests package
* wip
* refactor: make fakestore in service
* wip
* wip
* wip
* working tests
* trailing whitespaces
* Update pkg/services/serviceaccounts/api/api.go
* Update pkg/services/serviceaccounts/tests/common.go
* Update pkg/services/serviceaccounts/tests/common.go
* refactor: doc string for retriever
* fix import unused
* remove: serviceaccount from featuretoggle
* added: back legacy serviceaccounts feature toggle
* added: docs
* refactor: make query for the SearchQuery
* add: validation of service input fields
* add validation
