git: Add git clone open listener

[AlvaroParker]

Adds a git clone open listener to clone and open repos using zed zed://git/clone/<url> .

This will also allow creating "Open with Zed" buttons on websites with a href to something like zed://git/clone/https://github.com/zed-industries/zed.git.

Demo:

2025-10-31.14-43-16.mp4

Release Notes:

• Added git clone open listeners using zed://git/clone/<git-url>

[Angelk90]

@AlvaroParker : Would it be possible to do something like this?
zed zed://git/clone/<url> --single-branch
zed zed://git/clone/<url> --single-branch -b feature-a

look: https://git-scm.com/docs/git-clone#_options

[AlvaroParker]

@Angelk90 Currently the git clone backend implementation doesn't support that (single branch, -b argument, etc), and adding that I think is out of scope for this PR

zed/crates/fs/src/fs.rs

Lines 962 to 978 in 07dcb8f

	async fn git_clone(&self, repo_url: &str, abs_work_directory: &Path) -> Result<()> {
	let output = new_smol_command("git")
	.current_dir(abs_work_directory)
	.args(&["clone", repo_url])
	.output()
	.await?;
	if !output.status.success() {
	anyhow::bail!(
	"git clone failed: {}",
	String::from_utf8_lossy(&output.stderr)
	);
	}
	Ok(())
	}

[AlvaroParker]

I'll probably remove the cloning modal notification if #41712 gets merged