CTHUB - Improve Upload Flow - Update Template Download Button, Add Tooltip

**Describe the task**
Update the user interface to improve the clarity and functionality of the dataset upload process. This task involves changing the template download button to be more user-friendly, adding a tooltip for inactive areas, and improving the overall upload flow.

**Mockups**
Prototype - https://www.figma.com/proto/K7gNHRnlYuG27w8XGVquY5/Warnings%2FErrors?page-id=0%3A1&node-id=563-275&node-type=frame&viewport=1489%2C-616%2C0.09&t=dyOi09ahQ34TwtGe-1&scaling=scale-down-width&content-scaling=fixed&starting-point-node-id=563%3A275
Mockups - https://www.figma.com/design/K7gNHRnlYuG27w8XGVquY5/Warnings%2FErrors?node-id=1-470&t=D1b6xL7cuq7xDBsp-1

**Purpose**
To enhance the user experience during the file upload process by providing clearer options, better guidance, and smoother interactions.

**Acceptance Criteria**
- [x] Template Download Button: The template download button should now appear as a standard button, visually consistent with other buttons in the system, for easier user identification.
- [x] Tooltip for Drag-and-Drop Area: A tooltip should appear when hovering over the inactive drag-and-drop area, guiding the user to delete the existing dataset to activate the area and upload a new file. "To upload another dataset, please delete the current dataset by clicking the delete icon next to the file name and size."