Remove pinning tests for boards

To run the pin test, revert this commit then run

```
./scripts/pin_boards.sh
```

ee/spec/features/boards/boards_pin_spec.rb

-# frozen_string_literal: true
-
-require 'spec_helper'
-
-describe 'issue boards', :js do
-  include DragTo
-
-  let(:group) { create(:group, name: 'test_group') }
-  let(:owner) { create(:group_member, :owner, group: group, user: create(:user, name: 'shodan' )).user }
-  let(:project) { create(:project, :public, name: 'test_project', namespace: group) }
-  let(:board) { create(:board, project: project) }
-  let(:planning) { create(:label, project: project, name: 'Planning') }
-  let(:label) { create(:label, project: project) }
-  let(:milestone) { create(:milestone, project: project) }
-  let(:user) { create(:user) }
-
-  before do
-    stub_licensed_features(board_assignee_lists: true, board_milestone_lists: true)
-  end
-
-  shared_examples 'run pins' do |type|
-    let!(:list1) { create(:list, board: board, label: planning, position: 0) }
-    let!(:list2) { create(:list, board: board, label: label, position: 1) }
-    let!(:list3) { create(:milestone_list, board: board, milestone: milestone, position: 2) }
-    let!(:list4) { create(:user_list, board: board, user: owner, position: 3) }
-    let!(:issue) { create(:labeled_issue, project: project, title: 'abc', description: 'def', labels: [planning]) }
-    let!(:issue2) { create(:labeled_issue, project: project, title: 'hij', description: 'klm', labels: [label]) }
-    let!(:issue3) { create(:issue, project: project, title: 'nop', description: 'qrs', milestone: milestone) }
-
-    pin_type = ENV['PIN_TYPE'] || 'pin'
-    type = "#{type}.#{pin_type}"
-
-    it 'as_guest' do
-      project.add_guest(user)
-      login_as(user)
-
-      visit_board_page
-
-      save_pin('as_guest', type)
-    end
-
-    it 'as_developer' do
-      project.add_developer(user)
-      login_as(user)
-
-      visit_board_page
-
-      save_pin('as_developer', type)
-    end
-
-    it 'as_maintainer' do
-      project.add_maintainer(user)
-      login_as(user)
-
-      visit_board_page
-
-      save_pin('as_maintainer', type)
-    end
-  end
-
-  context "ff off" do
-    before do
-      stub_feature_flags(sfc_issue_boards: false)
-    end
-
-    it_behaves_like 'run pins', 'ff_off'
-  end
-
-  context "ff on" do
-    before do
-      stub_feature_flags(sfc_issue_boards: true)
-    end
-
-    it_behaves_like 'run pins', 'ff_on'
-  end
-
-  def visit_board_page
-    visit project_boards_path(project)
-    wait_for_requests
-  end
-
-  def save_pin(name, type)
-    path = File.dirname(__FILE__) + "/pins/#{name}.#{type}.html"
-
-    html = page.find('.boards-app')['outerHTML']
-
-    File.write(path, html, mode: 'wb')
-  end
-end

scripts/pin_boards.sh

-#!/usr/bin/env bash
-
-set -e
-
-PIN_TYPE="${PIN_TYPE:-pin}"
-SPEC_DIR="ee/spec/features/boards"
-SPEC_FILE="${SPEC_DIR}/boards_pin_spec.rb"
-PIN_DIR="${SPEC_DIR}/pins"
-
-echo "Running pins (${PIN_TYPE})..."
-
-bundle exec spring rspec "${SPEC_FILE}"
-
-for f in ${PIN_DIR}/*.${PIN_TYPE}.html; do
-  echo "Cleaning pin ($f)..."
-  sed -E -i.bak 's/127.0.0.1:[0-9]+/127.0.0.1/g; s/<!---->//g; s#assets/icons-[0-9a-zA-Z]+\.svg#assets/iconstest.svg#g' "$f"
-done
-
-rm ${PIN_DIR}/*.bak
-
-yarn run prettier --write "${PIN_DIR}/*.${PIN_TYPE}.html"
-
-if [ "$PIN_TYPE" = "pin" ]; then
-  for f in ${PIN_DIR}/*.${PIN_TYPE}.html; do
-    oracle=$(echo $f | sed 's/pin.html$/oracle.html/')
-    diff -u $oracle $f
-  done
-fi