test(s3/versioning): read the whole version body instead of one Read (#10815)

A single Read on the response body can return the last bytes together
with io.EOF, so asserting NoError on it fails even though the body is
complete. Use io.ReadAll, like every other test in this package.

test/s3/versioning/s3_versioning_pagination_stress_test.go

@@ -3,6 +3,7 @@ package s3api
 import (
 	"context"
 	"fmt"
+	"io"
 	"os"
 	"strings"
 	"testing"
@@ -184,12 +185,11 @@ func TestVersioningPaginationOver1000Versions(t *testing.T) {
 			})
 			require.NoError(t, err, "Failed to get version at index %d", idx)
 
-			buf := make([]byte, len(expectedContent))
-			_, err = getResp.Body.Read(buf)
-			require.NoError(t, err)
+			body, err := io.ReadAll(getResp.Body)
 			getResp.Body.Close()
+			require.NoError(t, err, "Failed to read version at index %d", idx)
 
-			assert.Equal(t, expectedContent, string(buf), "Content mismatch for version %d", idx+1)
+			assert.Equal(t, expectedContent, string(body), "Content mismatch for version %d", idx+1)
 		}
 	})
 }