feat(dashboard): Submit forms on Cmd + Enter (#9623)

**What**
- Changes all forms to only submit on Cmd/Ctrl + Enter instead of just Enter.
- Cleans up the position of submit/cancel buttons in many FocusModals that still had them in the header.
- Fixes responsiveness of multiple forms
- Removes the SplitView component, and replaces its usages with StackedDrawer/Modal to align the UX across the project.

Resolves CC-103, CC-535

packages/admin/dashboard/src/components/utilities/visually-hidden/index.ts

@@ -0,0 +1 @@
+export * from "./visually-hidden"

packages/admin/dashboard/src/components/utilities/visually-hidden/visually-hidden.tsx

@@ -0,0 +1,5 @@
+import { PropsWithChildren } from "react"
+
+export const VisuallyHidden = ({ children }: PropsWithChildren) => {
+  return <span className="sr-only">{children}</span>
+}