Move middleware context handler logic to service (#29605)

* middleware: Move context handler to own service

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

Co-authored-by: Emil Tullsted <sakjur@users.noreply.github.com>
Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>

pkg/services/auth/testing.go

@@ -57,8 +57,13 @@ func NewFakeUserAuthTokenService() *FakeUserAuthTokenService {
 	}
 }
 
-func (s *FakeUserAuthTokenService) CreateToken(ctx context.Context, userId int64, clientIP net.IP,
-	userAgent string) (*models.UserToken, error) {
+// Init initializes the service.
+// Required for dependency injection.
+func (s *FakeUserAuthTokenService) Init() error {
+	return nil
+}
+
+func (s *FakeUserAuthTokenService) CreateToken(ctx context.Context, userId int64, clientIP net.IP, userAgent string) (*models.UserToken, error) {
 	return s.CreateTokenProvider(context.Background(), userId, clientIP, userAgent)
 }