[ResponseOps][MW] Update MW banner (#234535)

## Summary

We have had some complaints about the maintenance window banner.

<img width="2295" height="428" alt="image (1)"
src="https://github.com/user-attachments/assets/b657a9f3-bd58-41d3-98f3-d674bb72da86"
/>

> Maintenances are running and **ALL** your rule notifications are
paused

The banner text was misleading, so I updated it.

<img width="917" height="433" alt="Screenshot 2025-09-10 at 10 41 31"
src="https://github.com/user-attachments/assets/efa36975-286d-4ffe-8410-119c7e32cc24"
/>

Author: adcoelho

src/platform/packages/shared/kbn-alerts-ui-shared/src/maintenance_window_callout/index.test.tsx

@@ -179,7 +179,8 @@ describe('MaintenanceWindowCallout', () => {
       expect(kibanaServicesMock.notifications.toasts.addError).toHaveBeenCalledTimes(1);
       expect(kibanaServicesMock.notifications.toasts.addError).toHaveBeenCalledWith(mockError, {
         title: 'Failed to check if maintenance windows are active',
-        toastMessage: 'Rule notifications are stopped while maintenance windows are running.',
+        toastMessage:
+          'Some rule notifications may be stopped while maintenance windows are running.',
       });
     });
   });

src/platform/packages/shared/kbn-alerts-ui-shared/src/maintenance_window_callout/translations.ts

@@ -12,7 +12,7 @@ import { i18n } from '@kbn/i18n';
 export const MAINTENANCE_WINDOW_RUNNING_DESCRIPTION = i18n.translate(
   'alertsUIShared.maintenanceWindowCallout.maintenanceWindowActiveDescription',
   {
-    defaultMessage: 'Rule notifications are stopped while maintenance windows are running.',
+    defaultMessage: 'Some rule notifications may be stopped while maintenance windows are running.',
   }
 );
 export const MAINTENANCE_WINDOW_NO_CATEGORY_TITLE = i18n.translate(

src/platform/packages/shared/kbn-alerts-ui-shared/src/maintenance_window_callout/use_fetch_active_maintenance_windows.ts

@@ -38,6 +38,6 @@ const FETCH_ERROR = i18n.translate('alertsUIShared.maintenanceWindowCallout.fetc
 const FETCH_ERROR_DESCRIPTION = i18n.translate(
   'alertsUIShared.maintenanceWindowCallout.fetchErrorDescription',
   {
-    defaultMessage: 'Rule notifications are stopped while maintenance windows are running.',
+    defaultMessage: 'Some rule notifications may be stopped while maintenance windows are running.',
   }
 );

x-pack/platform/plugins/shared/alerting/public/pages/maintenance_windows/translations.ts

@@ -405,7 +405,7 @@ export const SOLUTION_CONFIG_REMOVAL_WARNING_SUBTITLE = i18n.translate(
   'xpack.alerting.maintenanceWindows.solutionConfigRemovalWarning.subtitle',
   {
     defaultMessage:
-      'When you save the changes, the maintenance window will affect rules in all solutions.',
+      'When you save the changes, the maintenance window will affect all rules that meet the filtering criteria.',
   }
 );
 

x-pack/platform/plugins/shared/triggers_actions_ui/public/application/sections/rules_list/components/rules_list.test.tsx

@@ -1406,7 +1406,9 @@ describe('MaintenanceWindowsMock', () => {
 
     await waitFor(() => expect(fetchActiveMaintenanceWindowsMock).toHaveBeenCalledTimes(1));
     expect(
-      screen.queryByText('Rule notifications are stopped while maintenance windows are running.')
+      screen.queryByText(
+        'Some rule notifications may be stopped while maintenance windows are running.'
+      )
     ).not.toBeInTheDocument();
   });