Remove CSS Classes gl-min-w-12 and gl-pl-12 of legacy utilities file

What does this MR do and why?

Remove two CSS utilities of utilities.css file. This one does not need further changes. The TailwindCSS/GitLab UI CSS Util isareoverriding these utilities. The values are correct and the same as before.

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Before	After

How to set up and validate locally

• Go to http://gdk.test:3000/flightjs/Flight/edit
• Check gl-min-w-12 on the Collapse Button

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• In the rails console rails c, enable feature flag: Feature.enable(:ui_for_organizations)
• Go to http://gdk.test:3000/-/organizations/default/groups_and_projects

Close #482698 (closed) #482697 (closed)