Add user-visible output for remote operations (#25849)

This PR adds toasts for reporting success and errors from remote git
operations. This PR also adds a focus handle to notifications, in
anticipation of making them keyboard accessible.

Release Notes:

- N/A

---------

Co-authored-by: julia <julia@zed.dev>

Cargo.lock

@@ -5353,6 +5353,7 @@ dependencies = [
  "serde_json",
  "smol",
  "sum_tree",
+ "tempfile",
  "text",
  "time",
  "unindent",
@@ -5408,7 +5409,9 @@ dependencies = [
  "gpui",
  "itertools 0.14.0",
  "language",
+ "linkify",
  "linkme",
+ "log",
  "menu",
  "multi_buffer",
  "panel",