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>

web_src/css/repo/home.css

@@ -54,7 +54,9 @@
   gap: var(--page-spacing);
 }
 
-.repo-view-container .repo-view-file-tree-container {
+.repo-view-file-tree-container {
+  display: flex;
+  flex-direction: column;
   flex: 0 0 15%;
   min-width: 0;
   max-height: 100vh;
@@ -65,6 +67,12 @@
   overflow-y: hidden;
 }
 
+@media (max-width: 767.98px) {
+  .repo-view-file-tree-container {
+    display: none;
+  }
+}
+
 .repo-view-content {
   flex: 1;
   min-width: 0;