Draft: Convert groups.scss into a page specfic bundle and cleanup some unused CSS

What does this MR do and why?

Moves stylesheets/pages/groups.scss to page_bundles/groups.scss CSS and cleans up some unused CSS.

Screenshots

	Before	After
Dashboard/Groups
Explore/Groups

How to set up and validate locally

Most of the CSS in groups.scss is related to the list display of groups. You can validate those changes by visiting:

1. Your work > groups
2. Clicking the Your groups tab and explore tab

This file also contains CSS for this element: . Which is scattered around the product. You can validate that this is displaying correctly by visiting:

1. dashboard/projects (Yours, starred, explore) on your dashboard
2. dashboard/groups
3. ...

Screenshots of the user access badge

And finally this file contains CSS to style an input group in the settings. This only affects the visuals if there is a long URL so the simplest way to verify is that the CSS is applied to the .group-root-path element

Numbered steps to set up and validate the change are strongly suggested.

<!114285 (merged) -- Example below:

1. Enable the invite modal

   Feature.enable(:invite_members_group_modal)

2. In rails console enable the experiment fully

   Feature.enable(:member_areas_of_focus)

3. Visit any group or project member pages such as http://127.0.0.1:3000/groups/flightjs/-/group_members
4. Click the invite members button. -->

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #239833