web: codemod `web/UserSettingsArea` `web/RepoContainer` `RepoRevisionContainer`

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

• Gitstart Issue
• SourceGraph Issue

Success criteria

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

• client/web/src/user/settings/UserSettingsArea.tsx
• client/web/src/repo/RepoContainer.tsx
• client/web/src/repo/RepoRevisionContainer.tsx