Refactor: Email verification (#84393)

* Update template names

* Add verifier that we can use to start verify process

* Use userVerifier when verifying email on update

* Add tests
---------

Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

pkg/services/temp_user/tempusertest/fake.go

@@ -0,0 +1,37 @@
+package tempusertest
+
+import (
+	"context"
+
+	tempuser "github.com/grafana/grafana/pkg/services/temp_user"
+)
+
+var _ tempuser.Service = (*FakeTempUserService)(nil)
+
+type FakeTempUserService struct {
+	tempuser.Service
+	CreateTempUserFN              func(ctx context.Context, cmd *tempuser.CreateTempUserCommand) (*tempuser.TempUser, error)
+	ExpirePreviousVerificationsFN func(ctx context.Context, cmd *tempuser.ExpirePreviousVerificationsCommand) error
+	UpdateTempUserWithEmailSentFN func(ctx context.Context, cmd *tempuser.UpdateTempUserWithEmailSentCommand) error
+}
+
+func (f *FakeTempUserService) CreateTempUser(ctx context.Context, cmd *tempuser.CreateTempUserCommand) (*tempuser.TempUser, error) {
+	if f.CreateTempUserFN != nil {
+		return f.CreateTempUserFN(ctx, cmd)
+	}
+	return nil, nil
+}
+
+func (f *FakeTempUserService) ExpirePreviousVerifications(ctx context.Context, cmd *tempuser.ExpirePreviousVerificationsCommand) error {
+	if f.ExpirePreviousVerificationsFN != nil {
+		return f.ExpirePreviousVerificationsFN(ctx, cmd)
+	}
+	return nil
+}
+
+func (f *FakeTempUserService) UpdateTempUserWithEmailSent(ctx context.Context, cmd *tempuser.UpdateTempUserWithEmailSentCommand) error {
+	if f.UpdateTempUserWithEmailSentFN != nil {
+		return f.UpdateTempUserWithEmailSentFN(ctx, cmd)
+	}
+	return nil
+}