Merge branch 'vs/remove-gtm-from-sign-in-pages' into 'master'

Remove GTM from Sign In page

See merge request gitlab-org/gitlab!75181

app/views/devise/sessions/new.html.haml

 - page_title _("Sign in")
 - content_for :page_specific_javascripts do
-  = render "layouts/google_tag_manager_head"
   = render "layouts/one_trust"
-= render "layouts/google_tag_manager_body"
 
 #signin-container
   - if any_form_based_providers_enabled?