List-group: Make `.list-group-item-action` style more specific than `.list-group-item`.

[louismaximepiton]

Description

Reintroduce #35759 changes by reverting #36018. Changed the CSS to guard rail the .active style to be overridden on the different states.

Motivation & Context

List-group items with actions are never using their color.

Type of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Refactoring (non-breaking change)
• [ ] Breaking change (fix or feature that would change existing functionality)

Checklist

• [x] I have read the contributing guidelines
• [x] My code follows the code style of the project (using npm run lint)
• [x] My change introduces changes to the documentation
• [x] I have updated the documentation accordingly
• [x] I have added tests to cover my changes
• [x] All new and existing tests passed

Live previews

• https://deploy-preview-39064--twbs-bootstrap.netlify.app/docs/5.3/components/list-group#variants

Related issues

Closes #39047.