flaky: skip TestAPMConfig (#8951) (#8956)

(cherry picked from commit ff9d9fc)

Co-authored-by: Panos Koutsovasilis <[email protected]>

Author: mergify[bot]

testing/integration/ess/apm_propagation_test.go

@@ -56,6 +56,8 @@ func TestAPMConfig(t *testing.T) {
 		Group: integration.Default,
 		Stack: &define.Stack{},
 	})
+	t.Skip("Flaky test: https://github.com/elastic/elastic-agent/issues/5890")
+
 	f, err := define.NewFixtureFromLocalBuild(t, define.Version())
 	require.NoError(t, err)