Snapshots don't sort well in contexts (like IDEs) that sort by extension

[epage]

Problem

Right now, snapshots are stored as

<name>.in/
<name>.out/
<name>.stdout
<name>.stderr

In ls, this groups things well but in IDEs, it doesn't.

Steps

Open up the test snapshots in an IDE

Possible Solution(s)

Organize the snapshots as

<name>/in/
<name>/out/
<name>/stdout
<name>/stderr

Notes

We should wait on #10620 so we can update all of them at once

Version

No response

[epage]

Forgot to mention this but this should mean we can delete the scripts for copying / renaming since you can just copy or rename the directory

[Muscraft]

@rustbot claim