Enable bodyclose linter (#36168)

Enabe
[`bodyclose`](https://golangci-lint.run/docs/linters/configuration/#bodyclose).
The only issue in non-test code (`services/migrations/dump.go`) was a
false-positive and I think there are a number of undetected cases, but I
guess it's still better than not having it.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

services/migrations/gitea_downloader_test.go

@@ -27,6 +27,7 @@ func TestGiteaDownloadRepo(t *testing.T) {
 	if err != nil || resp.StatusCode != http.StatusOK {
 		t.Skipf("Can't reach https://gitea.com, skipping %s", t.Name())
 	}
+	defer resp.Body.Close()
 	ctx := t.Context()
 	downloader, err := NewGiteaDownloader(ctx, "https://gitea.com", "gitea/test_repo", "", "", giteaToken)
 	require.NoError(t, err, "NewGiteaDownloader error occur")