[MM-29999] User Limit Email Notifications (Part 2) (#16220)

* Adding files commiting to do something else

* Stashing to merge master

* Adding files, commit of working code, pre-test

* Changing up logic according to new conversations, adding template and functions for 7 day and 14 day emails

* Add subscription active check

* Add a comment around subscription status

* Fix i18n

* Update jobs/cloud/worker.go

Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>

* Add a check for cloud license and exit early

* remove log

* Update jobs/cloud/worker.go

Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>

* Remove case for 91st day

* Change var name

* Fix i18n

* Change value for dates in email

* Add email template and send logic for support email on 30th day of arrears

* Fix EETests?

* add one to the day so the count starts on first day of next cycle

* use the license for the enabled check

* Moved scheduler and worker into enterprise

* Add the user count to the support email

* remove a line

* Use the date for the 14 day email

* Fix for design review

* More font changes

* Fixes for PR

* Change feature flag name

* Add cloud_interface to einterfaces/jobs

* Add back & for running job server

* Remove unused constant

Co-authored-by: Maria A Nunez <maria.nunez@mattermost.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/job.go

@@ -22,6 +22,7 @@ const (
 	JOB_TYPE_EXPIRY_NOTIFY                  = "expiry_notify"
 	JOB_TYPE_PRODUCT_NOTICES                = "product_notices"
 	JOB_TYPE_ACTIVE_USERS                   = "active_users"
+	JOB_TYPE_CLOUD                          = "cloud"
 
 	JOB_STATUS_PENDING          = "pending"
 	JOB_STATUS_IN_PROGRESS      = "in_progress"
@@ -65,6 +66,7 @@ func (j *Job) IsValid() *AppError {
 	case JOB_TYPE_PRODUCT_NOTICES:
 	case JOB_TYPE_EXPIRY_NOTIFY:
 	case JOB_TYPE_ACTIVE_USERS:
+	case JOB_TYPE_CLOUD:
 	default:
 		return NewAppError("Job.IsValid", "model.job.is_valid.type.app_error", nil, "id="+j.Id, http.StatusBadRequest)
 	}