fix(ui): bulk upload action bar buttons wrapping (#13486)

### What?

Added `white-space: nowrap` to the `.bulk-upload--actions-bar__buttons`
class to ensure button labels remain on a single line.

### Why?

In the bulk upload action bar, buttons containing multi-word labels were
wrapping to two lines, causing them to expand vertically and misalign
with other controls.

### How?

Applied `white-space: nowrap` to `.bulk-upload--actions-bar__buttons` so
all button labels stay on one line, maintaining consistent height and
alignment.

#### Before
<img width="1469" height="525" alt="Screenshot 2025-08-15 at 9 20 07 AM"
src="https://github.com/user-attachments/assets/aecc65ae-7b2f-43ba-96c8-1143fcee7f88"
/>

#### After
<img width="1474" height="513" alt="Screenshot 2025-08-15 at 9 19 55 AM"
src="https://github.com/user-attachments/assets/438c6ee1-b966-4966-8686-37ba4619a25c"
/>

packages/ui/src/elements/BulkUpload/ActionsBar/index.scss

@@ -47,6 +47,7 @@
       display: flex;
       gap: var(--base);
       margin-left: auto;
+      white-space: nowrap;
     }
 
     @include mid-break {