FIX (monitoring): Fix text of down and up messages to not be the same in heading and body

Author: RostislavDugin

backend/internal/features/healthcheck/attempt/check_pg_health_uc.go

@@ -224,7 +224,7 @@ func (uc *CheckPgHealthUseCase) sendDbStatusNotification(
 	messageBody := ""
 
 	if newHealthStatus == databases.HealthStatusAvailable {
-		messageTitle = fmt.Sprintf("✅ [%s] DB is back online", database.Name)
+		messageTitle = fmt.Sprintf("✅ [%s] DB is online", database.Name)
 		messageBody = fmt.Sprintf("✅ [%s] DB is back online", database.Name)
 	} else {
 		messageTitle = fmt.Sprintf("❌ [%s] DB is unavailable", database.Name)

backend/internal/features/healthcheck/attempt/check_pg_health_uc_test.go

@@ -303,7 +303,7 @@ func Test_CheckPgHealthUseCase(t *testing.T) {
 			t,
 			"SendNotification",
 			mock.Anything,
-			fmt.Sprintf("✅ [%s] DB is back online", database.Name),
+			fmt.Sprintf("✅ [%s] DB is online", database.Name),
 			fmt.Sprintf("✅ [%s] DB is back online", database.Name),
 		)
 	})