Migrate to Wire for dependency injection (#32289)

Fixes #30144

Co-authored-by: dsotirakis <sotirakis.dim@gmail.com>
Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>
Co-authored-by: Ida Furjesova <ida.furjesova@grafana.com>
Co-authored-by: Jack Westbrook <jack.westbrook@gmail.com>
Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>
Co-authored-by: Leon Sorokin <leeoniya@gmail.com>
Co-authored-by: Andrej Ocenas <mr.ocenas@gmail.com>
Co-authored-by: spinillos <selenepinillos@gmail.com>
Co-authored-by: Karl Persson <kalle.persson@grafana.com>
Co-authored-by: Leonard Gram <leo@xlson.com>

pkg/tsdb/postgres/postgres.go

@@ -8,7 +8,6 @@ import (
 
 	"github.com/grafana/grafana-plugin-sdk-go/data"
 	"github.com/grafana/grafana-plugin-sdk-go/data/sqlutil"
-	"github.com/grafana/grafana/pkg/registry"
 	"github.com/grafana/grafana/pkg/setting"
 	"github.com/grafana/grafana/pkg/util/errutil"
 
@@ -18,26 +17,21 @@ import (
 	"github.com/grafana/grafana/pkg/tsdb/sqleng"
 )
 
-func init() {
-	registry.Register(&registry.Descriptor{
-		Name:         "PostgresService",
-		InitPriority: registry.Low,
-		Instance:     &PostgresService{},
-	})
+func ProvideService(cfg *setting.Cfg) *PostgresService {
+	logger := log.New("tsdb.postgres")
+	return &PostgresService{
+		Cfg:        cfg,
+		logger:     logger,
+		tlsManager: newTLSManager(logger, cfg.DataPath),
+	}
 }
 
 type PostgresService struct {
-	Cfg        *setting.Cfg `inject:""`
+	Cfg        *setting.Cfg
 	logger     log.Logger
 	tlsManager tlsSettingsProvider
 }
 
-func (s *PostgresService) Init() error {
-	s.logger = log.New("tsdb.postgres")
-	s.tlsManager = newTLSManager(s.logger, s.Cfg.DataPath)
-	return nil
-}
-
 //nolint: staticcheck // plugins.DataPlugin deprecated
 func (s *PostgresService) NewExecutor(datasource *models.DataSource) (plugins.DataPlugin, error) {
 	s.logger.Debug("Creating Postgres query endpoint")