web: codemod `web/repo/settings` components to CSS modules

Created by: gitstart-sourcegraph

Descriptions

This PR results from the global-css-to-css-modules codemod application with some manual fixes, caused by the usage of global CSS classes tied to a React component in other parts of the codebase

Refs

• https://github.com/sourcegraph/sourcegraph/issues/25750

Success criteria

The stylesheets in the following directories are converted to CSS modules.

• client/web/src/repo/settings