Remove unused files

lib/bulk_imports/groups/graphql/get_milestones_query.rb

-# frozen_string_literal: true
-
-module BulkImports
-  module Groups
-    module Graphql
-      module GetMilestonesQuery
-        extend self
-
-        def to_s
-          <<-'GRAPHQL'
-          query ($full_path: ID!, $cursor: String, $per_page: Int) {
-            group(fullPath: $full_path) {
-              milestones(first: $per_page, after: $cursor, includeDescendants: false) {
-                page_info: pageInfo {
-                  next_page: endCursor
-                  has_next_page: hasNextPage
-                }
-                nodes {
-                  iid
-                  title
-                  description
-                  state
-                  start_date: startDate
-                  due_date: dueDate
-                  created_at: createdAt
-                  updated_at: updatedAt
-                }
-              }
-            }
-          }
-          GRAPHQL
-        end
-
-        def variables(context)
-          {
-            full_path: context.entity.source_full_path,
-            cursor: context.tracker.next_page,
-            per_page: ::BulkImports::Tracker::DEFAULT_PAGE_SIZE
-          }
-        end
-
-        def base_path
-          %w[data group milestones]
-        end
-
-        def data_path
-          base_path << 'nodes'
-        end
-
-        def page_info_path
-          base_path << 'page_info'
-        end
-      end
-    end
-  end
-end

spec/lib/bulk_imports/groups/graphql/get_milestones_query_spec.rb

-# frozen_string_literal: true
-
-require 'spec_helper'
-
-RSpec.describe BulkImports::Groups::Graphql::GetMilestonesQuery do
-  it 'has a valid query' do
-    tracker = create(:bulk_import_tracker)
-    context = BulkImports::Pipeline::Context.new(tracker)
-
-    query = GraphQL::Query.new(
-      GitlabSchema,
-      described_class.to_s,
-      variables: described_class.variables(context)
-    )
-    result = GitlabSchema.static_validator.validate(query)
-
-    expect(result[:errors]).to be_empty
-  end
-
-  describe '#data_path' do
-    it 'returns data path' do
-      expected = %w[data group milestones nodes]
-
-      expect(described_class.data_path).to eq(expected)
-    end
-  end
-
-  describe '#page_info_path' do
-    it 'returns pagination information path' do
-      expected = %w[data group milestones page_info]
-
-      expect(described_class.page_info_path).to eq(expected)
-    end
-  end
-end