Add "Go to file", "Delete Directory" to repo file list page (#35911)

/claim #35898
Resolves #35898 

### Summary of key changes:

1. Add file name search/Go to file functionality to repo button row.
2. Add backend functionality to delete directory
3. Add context menu for directories with functionality to copy path & delete a directory
4. Move Add/Upload file dropdown to right for parity with Github UI
5. Add tree view to the edit/upload UI

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/repository/files/temp_repo.go

@@ -135,6 +135,14 @@ func (t *TemporaryUploadRepository) LsFiles(ctx context.Context, filenames ...st
 	return fileList, nil
 }
 
+func (t *TemporaryUploadRepository) RemoveRecursivelyFromIndex(ctx context.Context, path string) error {
+	_, _, err := gitcmd.NewCommand("rm", "--cached", "-r").
+		AddDynamicArguments(path).
+		WithDir(t.basePath).
+		RunStdBytes(ctx)
+	return err
+}
+
 // RemoveFilesFromIndex removes the given files from the index
 func (t *TemporaryUploadRepository) RemoveFilesFromIndex(ctx context.Context, filenames ...string) error {
 	objFmt, err := t.gitRepo.GetObjectFormat()