fix(windows): fix env var glob casing (#9429)
### Description
In https://github.com/vercel/turborepo/issues/9424 a user had `path` as
their Windows env var instead of `Path` or `PATH`. On Windows
environment variables are case insensitive e.g. `process.env.PATH` and
`process.env.Path` would both return the same. While fetching them might
be the same
[`std::env::vars`](https://doc.rust-lang.org/std/env/fn.vars.html)
returns the environment variable names cased as they were declared even
though [`std::env::var`](https://doc.rust-lang.org/std/env/fn.var.html)
is case insensitive on Windows.
Take for example the following code:
```
for (key, value) in std::env::vars() {
println!("{key}: {value}");
let lowercase = key.to_ascii_lowercase();
println!("{lowercase}: {:?}", std::env::var(&lowercase));
}
```
On Windows it outputs:
```
...
PUBLIC: C:\Users\Public
public: Ok("C:\\Users\\Public")
SESSIONNAME: Console
sessionname: Ok("Console")
SystemDrive: C:
systemdrive: Ok("C:")
SystemRoot: C:\WINDOWS
systemroot: Ok("C:\\WINDOWS")
TEMP: C:\Users\Chris\AppData\Local\Temp
temp: Ok("C:\\Users\\Chris\\AppData\\Local\\Temp")
TMP: C:\Users\Chris\AppData\Local\Temp
tmp: Ok("C:\\Users\\Chris\\AppData\\Local\\Temp")
```
On macOs it outputs:
```
...
TMPDIR: /var/folders/3m/rxkycvgs5jgfvs0k9xcgp6km0000gn/T/
tmpdir: Err(NotPresent)
TMUX: /private/tmp/tmux-501/default,3104,0
tmux: Err(NotPresent)
TMUX_PANE: %4
tmux_pane: Err(NotPresent)
USER: olszewski
user: Err(NotPresent)
USER_ZDOTDIR: /Users/olszewski
user_zdotdir: Err(NotPresent)
```
Previously we had special casing for well known Windows env vars that
were set differently between Command Prompt and Powershell, but would
break if a user overwrote `Path` or `PATH` to `path`. This was brittle
and a correct solution would require that we include all casing
variations of all environment variables and users would also need to
know how env vars were declared on their Windows system.
This fix is to make our env var wildcard handling case in
### Testing Instructions
Added unit test to make sure we
