fix: Revert "fix: remove unused jquery-ui safe-active-element module (#…

…10708)" (#10924)

This reverts commit 9407e86.

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### What
After replicating the nutrient autosuggest selection problem (one of a
few JavaScript-related problems) described in #10861 in a local
development instance, I attempted a revert of #10708 because the name of
the dependency seems similar to a missing function that appeared in the
JavaScript console as an error:

```
Uncaught TypeError: e.ui.safeActiveElement is not a function
```

After reverting #10708, the error no longer appears and I'm able to
select entries from the nutrient autosuggest as expected.

### Screenshot

https://github.com/user-attachments/assets/eb40f7dd-3167-4c0b-a982-9bc46db06988

### Related issue(s) and discussion
- Fixes #10861 (in combination with #10877).

gulpfile.ts

@@ -104,6 +104,7 @@ function buildjQueryUi() {
     "./node_modules/jquery-ui/ui/position.js",
     "./node_modules/jquery-ui/ui/keycode.js",
     "./node_modules/jquery-ui/ui/unique-id.js",
+    "./node_modules/jquery-ui/ui/safe-active-element.js",
     "./node_modules/jquery-ui/ui/widgets/autocomplete.js",
     "./node_modules/jquery-ui/ui/widgets/menu.js",
   ]).