Revert "[SKIP ON MKI][DA] Deployment Agnostic api integration `burn_r…

…ate_rule.ts` (#196259)" (#196533)

This reverts commit 2c876e8.

### Details

The setting that made these tests fail has been reverted from the QA
environment for now.

x-pack/test/api_integration/deployment_agnostic/apis/observability/alerting/burn_rate_rule.ts

@@ -23,9 +23,7 @@ export default function ({ getService }: DeploymentAgnosticFtrProviderContext) {
   const isServerless = config.get('serverless');
   const expectedConsumer = isServerless ? 'observability' : 'slo';
 
-  describe('Burn rate rule', function () {
-    // see details: https://github.com/elastic/kibana/issues/196252
-    this.tags(['failsOnMKI']);
+  describe('Burn rate rule', () => {
     const RULE_TYPE_ID = 'slo.rules.burnRate';
     const DATA_VIEW = 'kbn-data-forge-fake_hosts.fake_hosts-*';
     const RULE_ALERT_INDEX = '.alerts-observability.slo.alerts-default';