Fixed `stylelint-gitlab/duplicate-selectors` for `ee/app/assets/stylesheets/pages/projects.scss`

What does this MR do?

For #10951 (closed) this MR fixes

123:3  ⚠  ".dropdown-item svg" and "svg (/Users/dmishunov/GitLab/gdk-ee/gitlab/ee/app/assets/stylesheets/pages/projects.scss -100:5)" have the same properties.           stylelint-gitlab/duplicate-selectors
171:7  ⚠  ".options-collapsed-icon" and ".options-expanded-icon (/Users/dmishunov/GitLab/gdk-ee/gitlab/ee/app/assets/stylesheets/pages/projects.scss -149:5)" have the    stylelint-gitlab/duplicate-selectors 
           same properties.

style-lint error for ee/app/assets/stylesheets/pages/projects.scss.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content