Modifies Package Registry group settings

What does this MR do and why?

Make changes to Package Registry group settings

• Changes title & description
• Removes flex-box for Exceptions toggle

This MR is part of series of MRs related to #363424 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Visit 'Group' > 'Settings' > 'Packages & Registries'
2. Confirm 'Package Registry' section has new title, changed description & layout for 'Exceptions' is changed

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.

spec/features/groups/settings/packages_and_registries_spec.rb

@@ -67,15 +67,16 @@
       visit_settings_page
 
       within '[data-testid="maven-settings"]' do
-        expect(page).to have_content('Allow duplicates')
+        expect(page).to have_content('Reject packages with the same name and version')
+        expect(page).not_to have_content('Exceptions')
 
         find('.gl-toggle').click
 
-        expect(page).to have_content('Reject packages with the same name and version')
+        expect(page).to have_content('Exceptions')
 
         visit_settings_page
 
-        expect(page).to have_content('Reject packages with the same name and version')
+        expect(page).to have_content('Exceptions')
       end
     end