Make Git remote URL parsing more robust (#19924)

This PR improves the parsing of Git remote URLs in order to make
features that depend on them more robust.

Previously we were just treating these as plain strings and doing
one-off shotgun parsing to massage them into the right format. This
meant that we weren't accounting for edge cases in URL structure.

One of these cases was HTTPS Git URLs containing a username, which can
arise when using GitHub Enterprise (see
https://github.com/zed-industries/zed/issues/11160).

We now have a `RemoteUrl` typed to represent a parsed Git remote URL and
use the `Url` parser to parse it.

Release Notes:

- Improved the parsing of Git remote URLs to support additional
scenarios.

crates/git/src/hosting_provider.rs

@@ -69,7 +69,7 @@ pub trait GitHostingProvider {
     /// Returns a formatted range of line numbers to be placed in a permalink URL.
     fn format_line_numbers(&self, start_line: u32, end_line: u32) -> String;
 
-    fn parse_remote_url<'a>(&self, url: &'a str) -> Option<ParsedGitRemote<'a>>;
+    fn parse_remote_url(&self, url: &str) -> Option<ParsedGitRemote>;
 
     fn extract_pull_request(
         &self,
@@ -159,10 +159,10 @@ impl GitHostingProviderRegistry {
     }
 }
 
-#[derive(Debug)]
-pub struct ParsedGitRemote<'a> {
-    pub owner: &'a str,
-    pub repo: &'a str,
+#[derive(Debug, PartialEq)]
+pub struct ParsedGitRemote {
+    pub owner: Arc<str>,
+    pub repo: Arc<str>,
 }
 
 pub fn parse_git_remote_url(