Inconsistencies in primary and secondary button placement

## Description
In some modals and pages in the app, primary buttons are on the left of secondary buttons, in other places they are on the right.

To ensure consistency and predictability for users, we may want to revisit what that pattern looks like.

## Steps to reproduce
1. Go to GC Forms > Edit
2. Add a question
3. Go to "More"
4. Then go to the top of the form and click the three dots to enter the modal for branding/classification
5. Notice how both treat buttons differently
6. There are likely some other instances where we also have a difference

## Details
- **Browser**: Edge
- **Operating system**: Windows
- **Environment**: Staging
- **Language**: French
- **Viewport**: Tablet

## Expected behaviour

Reevaluate all buttons.

Display button relationship the same way throughout the app.
cc @samsadasivan @connorscarolyns should primary button be on left or right in relation to secondary?

## Screenshots or videos



Start with the GC Forms > Edit flow, especially the More menu and the branding/classification modal shown in the reproduction steps. Compare their primary and secondary button placement, then inspect other app pages for the same inconsistency; done means the placement is consistent throughout the app after the left-versus-right design decision is made.

Written by the indexing model from the issue text.