Revise Environment.FailFast usage in pipe implementation #6510
Description
what does this do? Does this actually call Environment.FailFast()? Beware that this may generate a dump of the current process, if the LocalDumps registry key is enabled:
https://github.com/KirillOsenkov/dotfiles/blob/main/LocalDumps.reg
or Azure Watson might be listening too.
Not sure if this is desired, perhaps just do Environment.Exit()?
Originally posted by @KirillOsenkov in #6477 (comment)