[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/system.go

@@ -33,6 +33,8 @@ const (
 	SYSTEM_WARN_METRIC_LAST_RUN_TIMESTAMP_KEY     = "LastWarnMetricRunTimestamp"
 	AWS_METERING_REPORT_INTERVAL                  = 1
 	AWS_METERING_DIMENSION_USAGE_HRS              = "UsageHrs"
+	USER_LIMIT_OVERAGE_CYCLE_END_DATE             = "UserLimitOverageCycleEndDate"
+	OVER_USER_LIMIT_FORGIVEN_COUNT                = "OverUserLimitForgivenCount"
 )
 
 const (