Refactor older tests to use testify (#33140)

Refactor checks to use assert/require
Use require.Eventually for waiting in elastic and meilisearch tests
Use require to exit early instead of assert

modules/httplib/serve_test.go

@@ -13,6 +13,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestServeContentByReader(t *testing.T) {
@@ -71,9 +72,7 @@ func TestServeContentByReadSeeker(t *testing.T) {
 		}
 
 		seekReader, err := os.OpenFile(tmpFile, os.O_RDONLY, 0o644)
-		if !assert.NoError(t, err) {
-			return
-		}
+		require.NoError(t, err)
 		defer seekReader.Close()
 
 		w := httptest.NewRecorder()