Remove failing database backup spec

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/224536

spec/lib/backup/database_spec.rb

-# frozen_string_literal: true
-
-require 'spec_helper'
-
-describe Backup::Database do
-  let(:progress) { double('progress', print: nil, puts: nil) }
-
-  describe '#dump' do
-    subject { described_class.new(progress).dump }
-
-    let(:pg_schema) { nil }
-    let(:backup_config) { double('config', pg_schema: pg_schema, path: File.join(Rails.root, 'tmp')) }
-
-    before do
-      allow(Settings).to receive(:backup).and_return(backup_config)
-      allow(Process).to receive(:waitpid)
-    end
-
-    it 'does not limit pg_dump to any specific schema' do
-      expect(Process).to receive(:spawn) do |*cmd, _|
-        expect(cmd.join(' ')).not_to include('-n')
-      end
-
-      subject
-    end
-
-    it 'includes option to drop objects before restoration' do
-      expect(Process).to receive(:spawn) do |*cmd, _|
-        expect(cmd.join(' ')).to include('--clean')
-      end
-
-      subject
-    end
-
-    context 'with pg_schema configured explicitly' do
-      let(:pg_schema) { 'some_schema' }
-
-      it 'calls pg_dump' do
-        expect(Process).to receive(:spawn) do |*cmd, _|
-          expect(cmd.join(' ')).to start_with('pg_dump')
-        end
-
-        subject
-      end
-
-      it 'limits the psql dump to the specified schema' do
-        expect(Process).to receive(:spawn) do |*cmd, _|
-          expect(cmd.join(' ')).to include("-n #{pg_schema}")
-        end
-
-        subject
-      end
-
-      context 'extra schemas' do
-        Gitlab::Database::EXTRA_SCHEMAS.each do |schema|
-          it "includes the extra schema #{schema}" do
-            expect(Process).to receive(:spawn) do |*cmd, _|
-              expect(cmd.join(' ')).to include("-n #{schema}")
-            end
-
-            subject
-          end
-        end
-      end
-    end
-  end
-end