[PM-2276] Upgrade Storybook to v7 (#5258)

libs/components/src/banner/banner.mdx

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+import { Meta, Story, Controls, Canvas, Primary } from "@storybook/addon-docs";
+
+import * as stories from "./banner.stories";
+
+<Meta of={stories} />
+
+# Banner
+
+Banners are used for important communication with the user that needs to be seen right away, but has
+little effect on the experience. Banners appear at the top of the user's screen on page load and
+persist across all pages a user navigates to.
+
+- They should always be dismissable and never use a timeout. If a user dismisses a banner, it should
+  not reappear during that same active session.
+- Use banners sparingly, as they can feel intrusive to the user if they appear unexpectedly. Their
+  effectiveness may decrease if too many are used.
+- Avoid stacking multiple banners.
+- Banners support a button link (text button).
+
+<Primary />
+
+<Controls />
+
+## Types
+
+Icons should remain consistent across these types. Do not change the icon without consulting
+designers.
+
+Use the following guidelines to help choose the correct type of banner.
+
+### Premium
+
+<Story of={stories.Premium} />
+
+Used primarily to encourage user to upgrade to premium.
+
+### Info
+
+<Story of={stories.Info} />
+
+Used to communicate release notes, server maintenance or other informative event.
+
+### Warning
+
+<Story of={stories.Warning} />
+
+Used to alert the user of outdated info or versions.
+
+### Danger
+
+<Story of={stories.Danger} />
+
+Rarely used, but may be used to alert users over critical messages or very outdated versions.
+
+## Accessibility
+
+Banners sets the `role="status"` and `aria-live="polite"` attributes to ensure screen readers
+announce the content prior to the test of the page. This behaviour can be disabled by setting
+`[useAlertRole]="false"`.