Premium SKU (#30396)

* Added premium SKU

* removed duplicate enterprise license check functions

* Added license check on API layer

* lint fix

* lint fix

* refactured signature:

* test: Add comprehensive tests for license tier check functions

* fixed test

* text update

* optimised license checks

* fixedf test

* Updated license valid function

* webapp license checks

* handling prekium SKU in webappp:

* added plugin api method and general refactoring

* Updated tests

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/jobs/post_persistent_notifications/scheduler.go

@@ -21,8 +21,7 @@ func (scheduler *Scheduler) NextScheduleTime(cfg *model.Config, _ time.Time, _ b
 
 func MakeScheduler(jobServer *jobs.JobServer, licenseFunc func() *model.License) *Scheduler {
 	enabledFunc := func(_ *model.Config) bool {
-		l := licenseFunc()
-		return l != nil && (l.SkuShortName == model.LicenseShortSkuProfessional || l.SkuShortName == model.LicenseShortSkuEnterprise)
+		return model.MinimumProfessionalLicense(licenseFunc())
 	}
 	return &Scheduler{jobs.NewPeriodicScheduler(jobServer, model.JobTypePostPersistentNotifications, 0, enabledFunc)}
 }