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/app/report.go

@@ -199,7 +199,7 @@ func (a *App) GetUserCountForReport(filter *model.UserReportOptions) (*int64, *m
 }
 
 func (a *App) StartUsersBatchExport(rctx request.CTX, ro *model.UserReportOptions, startAt int64, endAt int64) *model.AppError {
-	if license := a.Srv().License(); license == nil || (license.SkuShortName != model.LicenseShortSkuProfessional && license.SkuShortName != model.LicenseShortSkuEnterprise) {
+	if !model.MinimumProfessionalLicense(a.Srv().License()) {
 		return model.NewAppError("StartUsersBatchExport", "app.report.start_users_batch_export.license_error", nil, "", http.StatusBadRequest)
 	}