Remove page_title from single view pages

- Remove page title from project show template
- Remove page title from group show template

app/views/groups/show.html.haml

 - breadcrumb_title _("Details")
-- page_title _("Groups")
 - @content_class = "limit-container-width" unless fluid_layout
 
 - if show_invite_banner?(@group)

app/views/projects/show.html.haml

 - breadcrumb_title _("Details")
-- page_title _("Projects")
 - @content_class = "limit-container-width" unless fluid_layout
 
 = content_for :meta_tags do

changelogs/unreleased/268315-restructure-project-page-title-to-show-project-name-first.yml

+---
+title: Remove page_title from single project and group pages
+merge_request: 46223
+author:
+type: fixed