nit(aci): fix borders on select all alert (#102977)

before

<img width="1434" height="904" alt="image"
src="https://github.com/user-attachments/assets/725d0d5c-6f51-470c-a7c0-8b3621fbc02c"
/>


after - looks the same as the issue stream

<img width="1362" height="116" alt="Screenshot 2025-11-07 at 11 40
57 AM"
src="https://github.com/user-attachments/assets/40153550-636d-4aa2-bbe6-8b375d4157a7"
/>

Author: ameliahsu

static/app/views/automations/components/automationListTable/actions.tsx

@@ -190,7 +190,7 @@ export function AutomationsTableActions({
         </ActionsBarWrapper>
       </SimpleTable.Header>
       {pageSelected && !allResultsVisible && (
-        <FullWidthAlert type="warning" showIcon={false}>
+        <FullWidthAlert type="warning" system showIcon={false}>
           <Flex justify="center" wrap="wrap" gap="md">
             {allInQuerySelected ? (
               tct('Selected all [count] alerts that match this search query.', {

static/app/views/detectors/components/detectorListTable/actions.tsx

@@ -214,7 +214,7 @@ export function DetectorsTableActions({
         </ActionsBarWrapper>
       </SimpleTable.Header>
       {pageSelected && !allResultsVisible && (
-        <FullWidthAlert type="warning" showIcon={false}>
+        <FullWidthAlert type="warning" system showIcon={false}>
           <Flex justify="center" wrap="wrap" gap="md">
             {allInQuerySelected ? (
               tct('Selected all [count] monitors that match this search query.', {