Fix broken commit metadata loading for large repository trees
## What does this MR do?
Fixes a regression introduced in !7208 in which a call to `ajaxGet()` would fail when loading metadata for large repository trees.
This call produced no errors in the console because it is contained in a sort of `eval` block in jQuery. This is an ugly, easily broken method for loading data asynchronously whose problems were exemplified by this issue. I'm opening a separate issue (#24660) to alter this implementation.
## Why was this MR needed?
The failing AJAX call was causing metadata to stop loading, and the `timeago` functionality to stop running due to script failure.
## Screenshots (if relevant)
## Does this MR meet the acceptance criteria?
- [ ] All builds are passing
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
## What are the relevant issue numbers?
Closes#24652
See merge request !7588
461d709c87