Improved build time of release builds by making "pages" job run in parallel with other things.

Before this, the build would get to a point where everything was done except the publish stage, "TestPackage" and "pages". The TestPackage job would take a long time to finish. Only when that job finished would "pages" start. The publish stage would then have to wait for the pages job to finish.

Instead we should just run the pages job as soon as it's dependency is done. That way the publish stage can start when the TestPackage job completes.