Update threat monitoring tab styling

ee/app/assets/javascripts/threat_monitoring/components/app.vue

@@ -105,7 +105,7 @@ export default {
       </h2>
     </header>
 
-    <gl-tabs>
+    <gl-tabs content-class="gl-pt-0">
       <gl-tab
         v-if="showAlertsTab"
         :title="s__('ThreatMonitoring|Alerts')"

ee/app/assets/javascripts/threat_monitoring/components/network_policy_list.vue

@@ -178,12 +178,12 @@ export default {
 
 <template>
   <div>
-    <div class="mb-2">
     <gl-alert
       v-if="hasAutoDevopsPolicy"
       data-testid="autodevopsAlert"
       variant="info"
       :dismissible="false"
+      class="gl-mb-3"
     >
       <gl-sprintf :message="$options.autodevopsNoticeDescription">
         <template #monospaced="{ content }">
@@ -194,7 +194,6 @@ export default {
         </template>
       </gl-sprintf>
     </gl-alert>
-    </div>
 
     <div class="pt-3 px-3 bg-gray-light">
       <div class="row justify-content-between align-items-center">