[MM-8497] Ability to set Do Not Disturb for a specified period of time (#17680)

* Revert "Revert "[MM-8497] Ability to set Do Not Disturb for a specified period of time (#16067)" (#17657)"

This reverts commit ff383990f8.

* add debug log for recurring function

* add feature flag for dnd timed status

* refactoring changes

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

model/scheduled_task_test.go

@@ -4,6 +4,7 @@
 package model
 
 import (
+	"sync"
 	"sync/atomic"
 	"testing"
 	"time"
@@ -73,3 +74,35 @@ func TestCancelTask(t *testing.T) {
 	time.Sleep(TASK_TIME + time.Second)
 	assert.EqualValues(t, 0, atomic.LoadInt32(executionCount))
 }
+
+func TestCreateRecurringTaskFromNextIntervalTime(t *testing.T) {
+	TASK_NAME := "Test Recurring Task starting from next interval time"
+	TASK_TIME := time.Second * 2
+
+	var executionTime time.Time
+	var mu sync.Mutex
+	testFunc := func() {
+		mu.Lock()
+		executionTime = time.Now()
+		mu.Unlock()
+	}
+
+	task := CreateRecurringTaskFromNextIntervalTime(TASK_NAME, testFunc, TASK_TIME)
+	defer task.Cancel()
+
+	time.Sleep(TASK_TIME)
+	mu.Lock()
+	expectedSeconds := executionTime.Second()
+	mu.Unlock()
+	assert.EqualValues(t, 0, expectedSeconds%2)
+
+	time.Sleep(TASK_TIME)
+	mu.Lock()
+	expectedSeconds = executionTime.Second()
+	mu.Unlock()
+	assert.EqualValues(t, 0, expectedSeconds%2)
+
+	assert.Equal(t, TASK_NAME, task.Name)
+	assert.Equal(t, TASK_TIME, task.Interval)
+	assert.True(t, task.Recurring)
+}