[Bug]: clone URL rewrite breaks when the HTTPS password contains @ #27846

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

packages/shared

Steps to reproduce

Call cloneUrlForProtocol("https://user:tok@en@github.com/a/b.git", "ssh").

Expected behavior

git@github.com:a/b.git (password may contain @; host is after the last userinfo @).

Actual behavior

git@en@github.com:a/b.git — the regex stopped userinfo at the first @.

Impact

Minor bug or occasional failure

Fix

#27845