windows: Make collab run on Windows (#23117)

I’ve also updated the documentation in
`development\local-collaboration.md` and
`docs\src\development\windows.md`.

Testing collab on my Windows machine:

![屏幕截图 2025-01-14
162021](https://github.com/user-attachments/assets/28b4a36a-e156-4012-981a-5d0a23dcc613)


Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/collab/src/bin/dotenv.rs

@@ -2,7 +2,11 @@ use collab::env::get_dotenv_vars;
 
 fn main() -> anyhow::Result<()> {
     for (key, value) in get_dotenv_vars(".")? {
-        println!("export {}=\"{}\"", key, value);
+        if option_env!("POWERSHELL").is_some() {
+            println!("$env:{}=\"{}\"", key, value);
+        } else {
+            println!("export {}=\"{}\"", key, value);
+        }
     }
     Ok(())
 }