fix(windows): fix env var glob casing

[chris-olszewski]

Description

In #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 returns the environment variable names cased as they were declared even though std::env::var 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

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[chris-olszewski]

Holding on merging this until 2.3 is released