[MM-51236] - Add opt-in checkbox in self-hosted account creation page (#22709)

* [MM-51236] - Add opt-in checkbox in self-hosted account creation page

* add server impl

* fix lint and translations

* add tests

* improvents

* fix model

* fix mocks

* feedback impl

* update text color

* handle error

* fix tests

server/channels/einterfaces/cloud.go

@@ -47,4 +47,5 @@ type CloudInterface interface {
 	CheckCWSConnection(userId string) error
 
 	SelfServeDeleteWorkspace(userID string, deletionRequest *model.WorkspaceDeletionRequest) error
+	SubscribeToNewsletter(userID string, req *model.SubscribeNewsletterRequest) error
 }

server/channels/einterfaces/mocks/CloudInterface.go

@@ -540,6 +540,20 @@ func (_m *CloudInterface) SelfServeDeleteWorkspace(userID string, deletionReques
 	return r0
 }
 
+// SubscribeToNewsletter provides a mock function with given fields: userID, req
+func (_m *CloudInterface) SubscribeToNewsletter(userID string, req *model.SubscribeNewsletterRequest) error {
+	ret := _m.Called(userID, req)
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(string, *model.SubscribeNewsletterRequest) error); ok {
+		r0 = rf(userID, req)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
 // UpdateCloudCustomer provides a mock function with given fields: userID, customerInfo
 func (_m *CloudInterface) UpdateCloudCustomer(userID string, customerInfo *model.CloudCustomerInfo) (*model.CloudCustomer, error) {
 	ret := _m.Called(userID, customerInfo)