[Infra] Fix infra/services ftr tests (#178300)

fixes [#176967](#176967)
fixes [#176950](#176950)

## Summary

Fix synthtrace call in setup and teardown to avoid cleaning the data
during test execution

Flaky test runner
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/5424

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

x-pack/test/api_integration/apis/metrics_ui/services.ts

@@ -19,14 +19,12 @@ export default function ({ getService }: FtrProviderContext) {
   describe('GET /infra/services', () => {
     const from = new Date(Date.now() - 1000 * 60 * 2).toISOString();
     const to = new Date().toISOString();
-    // FLAKY: https://github.com/elastic/kibana/issues/176950
-    describe.skip('with transactions', () => {
-      before(async () => {
-        await synthtrace.index(
-          generateServicesData({ from, to, instanceCount: 3, servicesPerHost: 3 })
-        );
-      });
-      after(() => synthtrace.clean());
+
+    describe('with transactions', () => {
+      before(async () =>
+        synthtrace.index(generateServicesData({ from, to, instanceCount: 3, servicesPerHost: 3 }))
+      );
+      after(async () => synthtrace.clean());
       it('returns no services with no data', async () => {
         const filters = JSON.stringify({
           'host.name': 'some-host',
@@ -82,14 +80,15 @@ export default function ({ getService }: FtrProviderContext) {
           .expect(400);
       });
     });
-    // FLAKY: https://github.com/elastic/kibana/issues/176967
-    describe.skip('with logs only', () => {
+    describe('with logs only', () => {
       before(async () => {
         await synthtrace.index(
           generateServicesLogsOnlyData({ from, to, instanceCount: 1, servicesPerHost: 2 })
         );
       });
-      after(() => synthtrace.clean());
+      after(async () => {
+        await synthtrace.clean();
+      });
       it('should return services with logs only data', async () => {
         const filters = JSON.stringify({
           'host.name': 'host-0',