Update 'branded' Storybook stories to use Component Story Format

Created by: umpox

Problem statement

The Component Story Format is the recommended way to write stories in Storybook. The new format is easier to understand and it is also important that we update our existing stories to ensure we stay up to date with new features, and are able to follow future documentation.

This issue is only concerned with stories in the client/branded folder Check out this Sourcegraph search result to view these stories.

Success criteria

• All stories in client/branded are using the Component Story Format
• All stories still usable when running yarn storybook:branded

Implementation details

Please see this PR description as an example of how this change can be implemented.

In summary, follow these implementation steps:

1. Modify existing storiesOf usage to ensure any add or alternative function calls are chained onto the original storiesOf function call. See this diff for an example of this change: https://github.com/sourcegraph/sourcegraph/pull/25222/commits/e3a39cae40c69cb74de1d0461bd70fb31bdb281a
2. Run the storiesof-to-csf Storybook codemod with this command: npx sb migrate storiesof-to-csf --glob="client/branded/**/*.story.tsx". For an expected diff (on different files) see this commit: https://github.com/sourcegraph/sourcegraph/commit/5a5b716337da4a768b4b26157d06728035c57816
3. Run the csf-hoist-story-annotations Storybook codemod with this command: npx sb migrate csf-hoist-story-annotations --glob="client/branded/**/*.story.tsx". For an expected diff (on different files) see this commit: https://github.com/sourcegraph/sourcegraph/commit/b228f5d5879b5164d23565c7d63480793e6004da
4. You will likely see TypeScript warnings on the newly-modified files. Update these by adding the Storybook types. See this commit for reference: https://github.com/sourcegraph/sourcegraph/commit/810e8e217d6a665f109ca2a0a92ba4125f6b27ea

Estimated amount of work

T-shirt size estimate: S