Migrate app/views/admin/users/_head.html.haml to Pajamas::ButtonComponent

What does this MR do and why?

Migrate app/views/admin/users/_head.html.haml to Pajamas::ButtonComponent

Screenshots or screen recordings

How to set up and validate locally

1. Go to Admin > Users then click on any user name. For example, http://127.0.0.1:3000/admin/users/reported_user_6.
2. Apply this diff to force show the button:

diff --git a/app/views/admin/users/_head.html.haml b/app/views/admin/users/_head.html.haml
index 529692df0b6..31814c7ab4c 100644
--- a/app/views/admin/users/_head.html.haml
+++ b/app/views/admin/users/_head.html.haml
@@ -31,7 +31,7 @@
       .gl-p-2
         - if impersonation_enabled? && @user.can?(:log_in)
           = link_to _('Impersonate'), impersonate_admin_user_path(@user), method: :post, class: "btn btn-default gl-button", data: { qa_selector: 'impersonate_user_link' }
-        - if can_force_email_confirmation?(@user)
+        - if true
           = render Pajamas::ButtonComponent.new(variant: :confirm, button_options: { class: 'js-confirm-modal-button', data: confirm_user_data(@user) }) do
             = _('Confirm user')
     .gl-p-2

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.

Related to #363918 (closed)