[chore]: enable len and empty rules from testifylint (#5832)

#### Description

Testifylint is a linter that provides best practices with the use of
testify.

This PR enables
[empty](https://github.com/Antonboom/testifylint?tab=readme-ov-file#empty)
and
[len](https://github.com/Antonboom/testifylint?tab=readme-ov-file#len)
rules from [testifylint](https://github.com/Antonboom/testifylint)

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

log/logtest/recorder_test.go

@@ -111,7 +111,7 @@ func TestLoggerEnabledFnUnset(t *testing.T) {
 func TestRecorderEmitAndReset(t *testing.T) {
 	r := NewRecorder()
 	l := r.Logger("test")
-	assert.Len(t, r.Result()[0].Records, 0)
+	assert.Empty(t, r.Result()[0].Records)
 
 	r1 := log.Record{}
 	r1.SetSeverity(log.SeverityInfo)