Remove unused partial

The last reference to this partial appears to have been removed exactly
three years ago(!) by
https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/22196.

Nowadays its functionality appears to be implemented by
`app/assets/javascripts/repository/components/breadcrumbs.vue`.

app/views/projects/buttons/_dropdown.html.haml

-- can_create_issue = show_new_issue_link?(@project)
-- can_create_project_snippet = can?(current_user, :create_snippet, @project)
-- can_push_code = can?(current_user, :push_code, @project)
-- create_mr_from_new_fork = can?(current_user, :fork_project, @project) && can?(current_user, :create_merge_request_in, @project)
-- merge_project = merge_request_source_project_for_project(@project)
-
-- show_menu = can_create_issue || can_create_project_snippet || can_push_code || create_mr_from_new_fork || merge_project
-
-- if show_menu
-  .project-action-button.dropdown.inline<
-    %a.btn.btn-default.gl-button.dropdown-toggle.has-tooltip.qa-create-new-dropdown{ href: '#', title: _('Create new...'), 'data-toggle' => 'dropdown', 'data-container' => 'body', 'aria-label' => _('Create new...'), 'data-display' => 'static' }
-      = sprite_icon('plus', css_class: 'gl-icon')
-      = sprite_icon("chevron-down", css_class: 'gl-icon')
-    %ul.dropdown-menu.dropdown-menu-right.project-home-dropdown
-      - if can_create_issue || merge_project || can_create_project_snippet
-        %li.dropdown-header= _('This project')
-
-      - if can_create_issue
-        %li= link_to _('New issue'), new_project_issue_path(@project)
-
-      - if merge_project
-        %li= link_to _('New merge request'), project_new_merge_request_path(merge_project)
-
-      - if can_create_project_snippet
-        %li= link_to _('New snippet'), new_project_snippet_path(@project)
-
-      - if can_push_code
-        %li.dropdown-header= _('This repository')
-
-      - if can_push_code
-        %li.qa-new-file-option= link_to _('New file'), project_new_blob_path(@project, @project.default_branch_or_main)
-        - unless @project.empty_repo?
-          %li= link_to _('New branch'), new_project_branch_path(@project)
-          %li= link_to _('New tag'), new_project_tag_path(@project)
-      - elsif can_collaborate_with_project?(@project)
-        %li= link_to _('New file'), project_new_blob_path(@project, @project.default_branch_or_main)
-      - elsif create_mr_from_new_fork
-        - continue_params = { to: project_new_blob_path(@project, @project.default_branch_or_main),
-                              notice: edit_in_new_fork_notice,
-                              notice_now: edit_in_new_fork_notice_now }
-        - fork_path = project_forks_path(@project, namespace_key: current_user.namespace.id, continue: continue_params)
-        %li= link_to _('New file'), fork_path, method: :post

locale/gitlab.pot

@@ -9929,9 +9929,6 @@ msgstr ""
 msgid "Create new project"
 msgstr ""
 
-msgid "Create new..."
-msgstr ""
-
 msgid "Create or import your first project"
 msgstr ""
 

qa/qa/page/project/show.rb

@@ -45,10 +45,6 @@ module QA
           element :tree_holder, '.tree-holder' # rubocop:disable QA/ElementWithPattern
         end
 
-        view 'app/views/projects/buttons/_dropdown.html.haml' do
-          element :create_new_dropdown
-        end
-
         view 'app/views/projects/buttons/_fork.html.haml' do
           element :fork_label, "%span= s_('ProjectOverview|Fork')" # rubocop:disable QA/ElementWithPattern
           element :fork_link, "link_to new_project_fork_path(@project)" # rubocop:disable QA/ElementWithPattern

spec/views/projects/buttons/_dropdown.html.haml_spec.rb

-# frozen_string_literal: true
-
-require 'spec_helper'
-
-RSpec.describe 'projects/buttons/_dropdown' do
-  let(:user) { create(:user) }
-
-  context 'user with all abilities' do
-    before do
-      assign(:project, project)
-
-      allow(view).to receive(:current_user).and_return(user)
-      allow(view).to receive(:can?).with(user, :push_code, project).and_return(true)
-      allow(view).to receive(:can_collaborate_with_project?).and_return(true)
-    end
-
-    context 'empty repository' do
-      let(:project) { create(:project, :empty_repo) }
-
-      it 'has a link to create a new file' do
-        render
-
-        expect(view).to render_template('projects/buttons/_dropdown')
-        expect(rendered).to have_link('New file')
-      end
-
-      it 'does not have a link to create a new branch' do
-        render
-
-        expect(view).to render_template('projects/buttons/_dropdown')
-        expect(rendered).not_to have_link('New branch')
-      end
-
-      it 'does not have a link to create a new tag' do
-        render
-
-        expect(view).to render_template('projects/buttons/_dropdown')
-        expect(rendered).not_to have_link('New tag')
-      end
-    end
-  end
-end