[RAM] Increase flaky test snooze duration to 10s (#159610)

## Summary

Fix #159076

Increases snooze expiry duration in hopes CI will catch it before it
disappears.

Passes flaky test runner:
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/2382

x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group4/snooze.ts

@@ -357,7 +357,7 @@ export default function createSnoozeRuleTests({ getService }: FtrProviderContext
       const response = await alertUtils.getSnoozeRequest(createdRule.id).send({
         snooze_schedule: {
           ...SNOOZE_SCHEDULE,
-          duration: 1000,
+          duration: 3000,
         },
       });
 
@@ -372,7 +372,7 @@ export default function createSnoozeRuleTests({ getService }: FtrProviderContext
         expect(updatedAlert.snooze_schedule).to.eql([
           {
             ...SNOOZE_SCHEDULE,
-            duration: 1000,
+            duration: 3000,
           },
         ]);
       });