Add support for self-hosted GitLab instances for Git permalinks (#19909)

This PR adds support for self-hosted GitLab instances when generating
Git permalinks.

If the `origin` Git remote contains `gitlab` in the URL hostname we will
then attempt to register it as a self-hosted GitLab instance.

A note on this: I don't think relying on specific keywords is going to
be a suitable long-term solution to detection. In reality the
self-hosted instance could be hosted anywhere (e.g.,
`vcs.my-company.com`), so we will ultimately need a way to have the user
indicate which Git provider they are using (perhaps via a setting).

Closes https://github.com/zed-industries/zed/issues/18012.

Release Notes:

- Added support for self-hosted GitLab instances when generating Git
permalinks.
- The instance URL must have `gitlab` somewhere in the host in order to
be recognized.

crates/worktree/Cargo.toml

@@ -29,6 +29,7 @@ fs.workspace = true
 futures.workspace = true
 fuzzy.workspace = true
 git.workspace = true
+git_hosting_providers.workspace = true
 gpui.workspace = true
 ignore.workspace = true
 language.workspace = true

crates/worktree/src/worktree.rs

@@ -19,6 +19,7 @@ use futures::{
     FutureExt as _, Stream, StreamExt,
 };
 use fuzzy::CharBag;
+use git::GitHostingProviderRegistry;
 use git::{
     repository::{GitFileStatus, GitRepository, RepoPath},
     status::GitStatus,
@@ -299,6 +300,7 @@ struct BackgroundScannerState {
     removed_entries: HashMap<u64, Entry>,
     changed_paths: Vec<Arc<Path>>,
     prev_snapshot: Snapshot,
+    git_hosting_provider_registry: Option<Arc<GitHostingProviderRegistry>>,
 }
 
 #[derive(Debug, Clone)]
@@ -1004,6 +1006,7 @@ impl LocalWorktree {
         let share_private_files = self.share_private_files;
         let next_entry_id = self.next_entry_id.clone();
         let fs = self.fs.clone();
+        let git_hosting_provider_registry = GitHostingProviderRegistry::try_global(cx);
         let settings = self.settings.clone();
         let (scan_states_tx, mut scan_states_rx) = mpsc::unbounded();
         let background_scanner = cx.background_executor().spawn({
@@ -1039,6 +1042,7 @@ impl LocalWorktree {
                         paths_to_scan: Default::default(),
                         removed_entries: Default::default(),
                         changed_paths: Default::default(),
+                        git_hosting_provider_registry,
                     }),
                     phase: BackgroundScannerPhase::InitialScan,
                     share_private_files,
@@ -2948,6 +2952,13 @@ impl BackgroundScannerState {
         log::trace!("constructed libgit2 repo in {:?}", t0.elapsed());
         let work_directory = RepositoryWorkDirectory(work_dir_path.clone());
 
+        if let Some(git_hosting_provider_registry) = self.git_hosting_provider_registry.clone() {
+            git_hosting_providers::register_additional_providers(
+                git_hosting_provider_registry,
+                repository.clone(),
+            );
+        }
+
         self.snapshot.repository_entries.insert(
             work_directory.clone(),
             RepositoryEntry {