Support SSH usernames which contain @ symbols (#25314)

Closes #25246

Release Notes:

- SSH: Improved handling of multiple `@` in connection strings: e.g.
`ssh jim.lv@es2@10.220.67.57@11.239.1.231` improving support of jump
hosts running JumpServer.

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Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/zed/Cargo.toml

@@ -124,7 +124,7 @@ time.workspace = true
 toolchain_selector.workspace = true
 ui.workspace = true
 url.workspace = true
-urlencoding = "2.1.2"
+urlencoding.workspace = true
 util.workspace = true
 uuid.workspace = true
 vim.workspace = true