Remove usages of .gl-xs-w-full utility

What does this MR do and why?

Remove usages of .gl-xs-w-full utility

This removes a few usages of the desktop-first .gl-xs-w-full CSS util. This brings us closer to having a fully mobile-first CSS utils library.

Screenshots or screen recordings

Context	Before	After
app/assets/javascripts/admin/abuse_report/components/reported_content.vue
app/assets/javascripts/analytics/product_analytics/components/activity_chart.vue	N/A	N/A
app/assets/javascripts/boards/components/board_content.vue
app/assets/javascripts/invite_members/components/invite_modal_base.vue
app/assets/javascripts/notes/components/discussion_resolve_button.vue
app/assets/javascripts/notes/components/discussion_resolve_with_issue_button.vue	Same as above	Same as above
app/assets/javascripts/projects/commit/components/commit_options_dropdown.vue
app/views/dashboard/todos/index.html.haml
app/views/projects/_invite_members_empty_project.html.haml
app/views/projects/commit/_commit_box.html.haml
app/views/projects/find_file/show.html.haml
ee/app/assets/javascripts/registrations/components/company_form.vue	N/A	N/A

How to set up and validate locally

Here are a few URLs that should be accessible on a default GDK install to review a few of those changes.

• Abuse report: http://gdk.test:3000/admin/abuse_reports/22
• Invite modal: http://gdk.test:3000/gitlab-org (click on + > Invite team members in the navigation sidebar).
• Resolve discussion buttons: http://gdk.test:3000/flightjs/Flight/-/merge_requests/4 (make sure to threadify some discussion).
• Issue boards: http://gdk.test:3000/flightjs/Flight/-/boards (click on Create list).
• Commit page: http://gdk.test:3000/flightjs/Flight/-/commit/f15b32277d2c55c6c595845a87109b09c913c556 (Browse files button and Options dropdown).
• Todos: http://gdk.test:3000/dashboard/todos
• Invite your team section: create an empty project.
• Find file: http://gdk.test:3000/flightjs/Flight/-/find_file/8749d49930866a4871fa086adbd7d2057fcc3ebb

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.