Fix tooltips and issue dependency styles (#13458)

- Convert all tooltips to JS-based ones, fixing overflow issues
- Restyle issue dependencies/dependants
- Move popup styles to base style
- CSS Helper tweaks
- Unify pseudo element selectors and lint for it

Fixes: https://github.com/go-gitea/gitea/issues/13400

templates/admin/user/edit.tmpl

@@ -90,7 +90,7 @@
 					</div>
 				</div>
 				<div class="inline field">
-					<div class="ui checkbox" data-tooltip="{{.i18n.Tr "admin.users.allow_git_hook_tooltip"}}">
+					<div class="ui checkbox poping up" data-content="{{.i18n.Tr "admin.users.allow_git_hook_tooltip"}}" data-variation="very wide">
 						<label><strong>{{.i18n.Tr "admin.users.allow_git_hook"}}</strong></label>
 						<input name="allow_git_hook" type="checkbox" {{if .User.CanEditGitHook}}checked{{end}} {{if DisableGitHooks}}disabled{{end}}>
 					</div>