ci: fix `exp/teatest` tests on windows

[andreynering]

We did a fix recently about golden files on Windows: #365

That fixed many tests on Windows, but on this repository two started failing. We need to figure it out if there is a better way this the below to handle \r\n golden files checkout by Git on Windows.

x/exp/golden/golden.go

Lines 78 to 80 in 59292a3

	if runtime.GOOS == "windows" {
	return strings.ReplaceAll(str, "\r\n", "\n")
	}

Perhaps we can remove the fix done on #365 and replace it by a .gitattributes file instructing Git to preserve *.golden files as is? We'd need to do this on all relevant repositories, though, not only on this one.

[aymanbagabas]

Perhaps we can remove the fix done on #365 and replace it by a .gitattributes file instructing Git to preserve *.golden files as is? We'd need to do this on all relevant repositories, though, not only on this one.

I like this idea, we can trea *.golden files as binary files. Then Git would leave them as is.