[MM-40917] - Inactive Server Email Notification (#19374)

* [MM-40917] - Inactive Server Email Notification

* add email template

* make store layers

* add some store tests

* fix translations

* fix logic

* improve

* fix lint

* feedback-impl

* fix wrong text

* optimize queries

* move feature flag check

* feedback impl-1

* add line

* feedback impl

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/feature_flags.go

@@ -72,6 +72,8 @@ type FeatureFlags struct {
 
 	NormalizeLdapDNs bool
 
+	EnableInactivityCheckJob bool
+
 	// Enable special onboarding flow for first admin
 	UseCaseOnboarding bool
 
@@ -105,6 +107,7 @@ func (f *FeatureFlags) SetDefaults() {
 	f.InlinePostEditing = false
 	f.BoardsDataRetention = false
 	f.NormalizeLdapDNs = false
+	f.EnableInactivityCheckJob = true
 	f.UseCaseOnboarding = false
 	f.WorkspaceOptimizationDashboard = false
 	f.GraphQL = false