[management] Avoid recalculating next peer expiration (#3991)

* Avoid recalculating next peer expiration

- Check if an account schedule is already running
- Cancel executing schedules only when changes occurs
- Add more context info to logs

* fix tests

management/server/account_test.go

@@ -1862,11 +1862,8 @@ func TestDefaultAccountManager_MarkPeerConnected_PeerLoginExpiration(t *testing.
 	require.NoError(t, err, "expecting to update account settings successfully but got error")
 
 	wg := &sync.WaitGroup{}
-	wg.Add(2)
+	wg.Add(1)
 	manager.peerLoginExpiry = &MockScheduler{
-		CancelFunc: func(ctx context.Context, IDs []string) {
-			wg.Done()
-		},
 		ScheduleFunc: func(ctx context.Context, in time.Duration, ID string, job func() (nextRunIn time.Duration, reschedule bool)) {
 			wg.Done()
 		},