Prevent command prompt from opening when running git blame on windows (#10747)

Release Notes:

- Fixed issue reported in discord where the git blame feature would open
command prompt windows

crates/git/src/commit.rs

@@ -4,15 +4,25 @@ use collections::HashMap;
 use std::path::Path;
 use std::process::Command;
 
+#[cfg(windows)]
+use std::os::windows::process::CommandExt;
+
 pub fn get_messages(working_directory: &Path, shas: &[Oid]) -> Result<HashMap<Oid, String>> {
     const MARKER: &'static str = "<MARKER>";
 
-    let output = Command::new("git")
+    let mut command = Command::new("git");
+
+    command
         .current_dir(working_directory)
         .arg("show")
         .arg("-s")
         .arg(format!("--format=%B{}", MARKER))
-        .args(shas.iter().map(ToString::to_string))
+        .args(shas.iter().map(ToString::to_string));
+
+    #[cfg(windows)]
+    command.creation_flags(windows::Win32::System::Threading::CREATE_NO_WINDOW.0);
+
+    let output = command
         .output()
         .map_err(|e| anyhow!("Failed to start git blame process: {}", e))?;