[8.16](backport #41891) Invoke m.Run on TestMain and reduce test flak…

…iness (#41906)

* invoke m.Run on TestMain and reduce test flakiness (#41891)

Some TestMain were not running any tests as they did not invoke m.Run. This change fixes that.

Also other tests were presenting some flakyness, therefore this change also attempts to fix the flakiness by setting really unique IDs for filestream tests and increasing a timeout for TestTranslateGUIDWithLDAP.

(cherry picked from commit 83251ea)

---------

Co-authored-by: Anderson Queiroz <anderson.queiroz@elastic.co>

filebeat/autodiscover/builder/hints/logs_test.go

@@ -18,6 +18,7 @@
 package hints
 
 import (
+	"os"
 	"path/filepath"
 	"testing"
 
@@ -30,8 +31,10 @@ import (
 	"github.com/elastic/elastic-agent-libs/paths"
 )
 
-func TestMain(t *testing.M) {
+func TestMain(m *testing.M) {
 	InitializeModule()
+
+	os.Exit(m.Run())
 }
 
 func TestGenerateHints(t *testing.T) {